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Ancillary K9 Dog Training

Denver, Colorado

4.9/5· 184 Google reviews

About Ancillary K9 Dog Training

Ancillary K9, Denver's premier dog behavior expert, transforms challenging behaviors with personalized, intensive training. Our certified trainers address aggression, anxiety, and obedience issues. Clients see rapid, lasting results, often within six sessions. Our programs empower you and your dog for long-term success. With our Lifetime Training Assurance, we guarantee free retraining if your dog regresses. Offering private training and 24/7 support, we help rebuild harmonious relationships.

Training & services

Training goals

  • Behavior consultation
    Program details

    Expert training to address unwanted behaviors such as anxiety, reactivity, or aggression. We create customized plans to correct issues, build positive habits, and improve your dog's overall behavior, ensuring a happier and more balanced companion.

    Comprehensive training designed to address complex behavioral issues such as anxiety, reactivity, and aggression. Tailored to your dog's unique needs, this program focuses on lasting solutions for a well-balanced and well-behaved companion.

    Effective behavioral modification for dogs with anxiety, fear, reactivity, or other challenges. We address root causes and help dogs become confident and calm, providing solutions for behavioral problems with customized training in Denver.

  • Leash training
  • Obedience training
    Program details

    Professional dog obedience training to teach essential commands, improve manners, and build a solid foundation for behavior. Ideal for dogs of all ages, ensuring they are well-behaved at home and in public. Serving Denver and nearby areas.

  • Puppy training
    Program details

    Trusted puppy training in Denver to build confidence and teach basic commands. We guide your puppy through early learning stages for better behavior, social skills, and obedience. Perfect for new dog owners in the Denver area.

  • Socialization

Behavior support

  • Aggression training
    Program details

    Specialized training to address aggression toward people or other dogs. We identify root causes and use proven techniques to build trust, improve behavior, and ensure safety. Tailored for lasting results and a stronger bond with your dog.

    Specialized aggressive dog behavior training to reduce reactivity and manage aggression. Our expert trainers help your dog overcome triggers and develop safer responses. Ideal for dogs showing aggression toward people or other dogs.

  • Fear and confidence
  • Reactivity training
    Program details

    Fast, effective reactive dog training in Denver for dogs that bark, lunge, growl, or struggle around other dogs and people. Practical training that gives you and your dog confidence and peace of mind.

  • Resource guarding
  • Separation anxiety

How training happens

  • Board and train
  • Group classes
  • Owner coaching Customer-reported
  • Private training
    Program details

    One-on-one private dog training tailored to meet your dog's unique needs. Focus on obedience, behavioral issues, or aggression with customized sessions designed for faster results. Serving Denver with personalized, professional dog training solutions.

Dog age

  • Puppies

Support between sessions

  • Homework and practice Customer-reported
  • Personalized training plans

Assistance and working dogs

  • Protection training
    Program details

    Protection dog training in Denver focused on control, obedience, confidence, and reliable behavior. Training is tailored to the individual dog, owner, and their goals.

Dog size

  • Large dogs Customer-reported

Your dog’s background

  • Rescue dogs
    Program details

    Dog training in Denver for rescue dogs adjusting to a new home or dealing with fear, anxiety, reactivity, or behavioral issues. We help build the bond between you and your dog.

Consultations

  • Free consultation

Other listed services

View 29 additional details
  • Dog training
    Program details

    Professional dog training to improve obedience, resolve behavioral issues, and reduce aggression. Tailored training programs for dogs of all ages and breeds, designed to achieve quick, lasting results. Serving Denver and nearby areas.

  • Aggressive Behaviors
  • Basic Commands
  • Behavioral Evaluations
  • Behavioral Program
  • Canine Rehabilitation
  • Court-ordered dog training
    Program details

    Court-ordered dog behavior training for legal compliance. Our training includes professional, detailed reports to meet court requirements. Available for Denver pet owners needing a thorough rebuilding of their dog's behavior.

  • Dog Behavior Assessments
  • Dog Bites
  • Dog Evaluations
  • Dog Park
  • Dog Starts
  • Dog Trainers Schedule
  • Dog behaviorist
    Program details

    Dog behaviorist specializing in solving behavioral issues like anxiety, fear, aggression, and reactivity. We provide tailored, humane behavior solutions to help dogs thrive in any environment. Serving Denver and surrounding areas.

  • Dog's Barks
  • Dogs Treats
  • Family Dogs
  • Guard Dogs
  • Obstacle Courses
  • Off-leash dog training
    Program details

    Expert off-leash dog training to ensure your dog listens reliably, even without a leash. We focus on building recall, focus, and responsiveness, providing the freedom to explore while staying under control. Serving Denver and nearby areas.

  • Shelter Dog
  • Dog Temperament Assessment
  • Dog Temperament Test
  • Working Dog Training
  • Dog Anxiety Training
    Program details

    Trusted dog training for anxious. We work on building confidence, creating structure, and transforming your dog's behavior.

  • Seperation Anxiety Dog Training
    Program details

    Separation anxiety dog training in Denver for dogs that struggle when left alone. We’ll build a practical training plan to help your dog become confident and independent.

  • Destructive Dog Training
    Program details

    Dog training for destructive behaviors like chewing and damaging the home. We’ll help your dog building better habits, boundaries, and structure.

  • Dog Expert Witness
    Program details

    Expert witness services for dog-related legal matters. Professional insight into canine behavior, temperament, aggression risk, and other issues in legal cases.

  • Dog Behavior Consulting for Legal Matters
    Program details

    Professional dog behavior consulting for legal matters. Experienced insight into canine behavior, aggression risk, evaluations, and other factors relevant to legal cases.

Confirm current programs and availability directly.

Questions & answers

From Google

What people have asked about this business.

Do you offer protection dog training?

Hi there! Yes, we offer Colorado's most trusted Protection Dog Training. We'll provide an assessment to ensure your dog is right for the role. Then we'll embark on a training journey that transforms your companion into a protection dog, and you into a strong handler. Please get in touch if you have more questions!

Community answer · Ancillary K9 Dog Training · 2025-12-21

Question on Google
Are there certain breeds that your dog training works best with?

Hi there! Though we have extensive knowledge and experience with Schutzhund and working breeds, our training is designed to work for any breed of dog. All breeds of dogs can have behavioral and aggression issues, and our training is equipped to tackle them all. If you have more questions, please get in touch!

Community answer · Ancillary K9 Dog Training · 2025-09-21

Question on Google
I'm struggling with a dog with serious behavior issues. Training in the past hasnt worked. Do you have any guarantees for your training?

Hi there! We specialize in hard to train or "problem dogs." Training is possible, even if other programs haven’t worked in the past. We are experts in dog behavior & obedience, and we guarantee fast, drastic changes in your dog. All of our programs come with Our Lifetime Support Guarantee, which is our promise to stand by you and your dog until your goals are achieved, as well as offering re-training if necessary.

Community answer · Ancillary K9 Dog Training · 2025-09-21

Question on Google
Do you offer puppy training? I have a puppy that's already starting to show some aggression and is proving hard to train.

Yes, we offer trusted puppy training. We correct your puppy's behavior fast, ensuring they have the best start at life. Correcting their behavior when they're young is the best way to see them grow to be a well-adjusted and happy adult dog. We'd love to help you tackle their behavior issues. Get in touch to get started!

Community answer · Ancillary K9 Dog Training · 2025-09-21

Question on Google
Do you only offer private dog training?

Private dog training offers tailored attention for specific behaviors and learning styles. It allows for flexible scheduling and results in faster progress. Our sessions are ideal for addressing unique issues, reducing distractions, ensuring a safe environment, and meeting individual goals. Owners receive immediate feedback and benefit from a private, relaxed setting, making it a preferred choice over group or board and train programs.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What training methods do you use?

In our training approach, we draw from the same methodologies used by law enforcement, military dog handlers, top sport dog trainers, and world-class competitors. Our methods are dynamic and are tailored to fit each unique situation. The tools and strategies we use hinge on the specific behaviors you want to address, your dog's individual temperament, and your proficiency and comfort as a handler. Our goal is effective, holistic training.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you handle training for court-ordered behavioral assessments?

Yes, we are well-equipped to handle court-ordered dog training and behavioral assessments. We understand the seriousness and sensitivity of these cases. Our team is able to provide comprehensive evaluations and design tailored training programs to address specific behavioral concerns. We're here to assist and ensure that both you and your dog navigate this process effectively. Please reach out to us to discuss your needs and learn more about how we can help.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you train aggressive dogs?

Yes, we have extensive experienced in addressing canine aggression. Whether it's biting, growling, or other aggressive behaviors, we employ evidence-based techniques to manage and reduce these behaviors. We understand that aggression can stem from various underlying causes, and our approach is both compassionate and tailored to each dog's individual needs. Our goal is to ensure safety and foster healthy dog-owner relationships.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you offer puppy training?

Yes, we absolutely offer puppy training! Starting early is key to a well-behaved adult dog. We recommend starting training for puppies once they reach 16 weeks of age and have been fully vaccinated against parvovirus. This ensures their safety while they embark on their training journey. Our puppy programs are tailored to the unique needs of young dogs, laying a strong foundation for future training. For a comprehensive overview, please visit our website.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What areas do you serve?

While our primary base is in the heart of Denver, our reputation has traveled well beyond city limits. In fact, we've had the privilege of working with passionate dog owners from as far as Vail and Aspen. This expansive reach underscores our commitment to excellence and the trust clients place in our services. Regardless of distance, we remain dedicated to providing premier dog training to help build stronger bonds between owners and their dogs.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What do you do to ensure your clients’ successes?

At the heart of our service, client success is paramount. We employ a diverse range of techniques and tools, ensuring each client benefits from the most effective and tailored training. Recognizing that questions and challenges arise, we provide unlimited phone, text, and email support between lessons, ensuring continuity in your dog's progress. Moreover, our commitment to you is unwavering, backed by our Lifetime Support Guarantee.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
Do you charge for help between lessons?

We do not! We believe in providing holistic support throughout your training journey. Not only do we NOT charge for assistance between lessons, but we also prioritize open communication. To encourage this, we give all our clients direct access to their trainer's personal contact details. This ensures 24/7 availability for phone, text, and email support. We're committed to standing by you every step of the way.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google
What is your policy if I am not happy with the training?

We operate on a mutual commitment principle. If you're fully engaged—attending sessions, asking questions, and completing homework—we'll match your dedication. Your input reflects the support you receive. While we're eager to help, progress requires joint effort. If you're fully committed, we'll stand by you and your dog until you achieve the goals you're aiming for.

Community answer · Ancillary K9 Dog Training · 2023-09-21

Question on Google

Public community answers. Authors are not verified as business representatives; details may have changed.

Customer reviews

Google listing
4.9
out of 5184 Google reviews

Mentioned in reviews

  • Reactive dog training 26
  • Confidence building 23
  • Aggressive dog training 16
  • Understanding dog behavior 16
  • Leash pulling 15
  • Obedience training 14
All 10 topics
  • Ecollar training 9
  • Flexible scheduling 6
  • Fearful dog training 3
  • Prong collar training 2

Google review topics, not confirmed services.

100 collected reviews

Text reviews first · newest first
Holly N
5/5
I can’t say enough wonderful things about Dion and Ancillary K9 Dog Training. I have the cutest miniature golden doodle that everyone thinks is so sweet. And, he is, 99% of the time but there is this 1% piece of him that caused him to bite multiple children and adults and feel …Read full reviewClose full review

I can’t say enough wonderful things about Dion and Ancillary K9 Dog Training. I have the cutest miniature golden doodle that everyone thinks is so sweet. And, he is, 99% of the time but there is this 1% piece of him that caused him to bite multiple children and adults and feel insecure around other dogs. He would always feel bad afterward but never enough to change the behavior. We had gone through four previous trainers that spanned from positive reinforcement training to choke collar training and the same aggressive behaviors reappeared, time and again. At 9 years of age, I wondered if our “old dog could learn new tricks”. We were at the point of deciding whether life was better with or without our dog and it was a horrible place to be. We decided to give training one last chance. Enter Dion and K9 Dog Training. Dion is smart, kind, fun, direct and extremely knowledgeable. He identified our dog’s behavior issues right away and taught us that in addition to training our dog, we had to train ourselves to make the dog respect us. This training is not for the faint of heart. But, I learned it is harder on the handler than it is on my hyper-protective and aggressive dog. Some of the sessions were hard for me to perform, but, ultimately, my dog has relinquished control, which has made him less stressed, non-aggressive and a happy dog 100% of the time. After 6 sessions, my dog can now sit and lay in position for an hour until we release him. I am finally in charge. I am no longer fearful when he’s around other dogs. Dion taught me the tools to make sure my dog is under my command and not the other way around. You will spend a considerable amount of money on training tools but you will have peace of mind that your dog will be able to behave in public so both the humans and the dog can relax. Dion and my changed dog were well worth the time, money and effort. I will be purchasing more sessions even though we have gone through the class package because this training has changed my life and my dog’s for the better.

Nick Heidmann
5/5
My wife and I rescued two new dogs last year in Dec 2023, a Rottweiler (Roman) and a Doberman (Gunner). We've had both breeds prior and she is a horse trainer so we've always had really well trained dogs. One of our two new dogs- Gunner the 120lb Doberman- was extremely pushy, la…Read full reviewClose full review

My wife and I rescued two new dogs last year in Dec 2023, a Rottweiler (Roman) and a Doberman (Gunner). We've had both breeds prior and she is a horse trainer so we've always had really well trained dogs. One of our two new dogs- Gunner the 120lb Doberman- was extremely pushy, lacked any structure, disregarded the rules, personal space, and discipline. He pulled hard on the leash and was reactive towards other dogs, bikers, and joggers outside our fence. He was reactive on the leash during walks and he bit both my wife and I multiple times early after his adoption, so we just didn't feel safe with him any more. We spent 6 months trying treats, positive only training (punishment would encite aggression), youtube videos, prong collars, e-collars etc, and finally decided to find a professional for help as we wanted to start having kids soon and we were exhausted tip-toeing around just waiting for the next bite incident. Through exhaustive research we found Dion and Ancillary K9 training. He was mentioned in multiple online forums as the "go-to" guy in Denver. He trains working dogs for scent work, bite work, protection work, as well as general obedience, reactivity, and aggression, so he understands large breeds and their behaviors. Many people had also mentioned that they had been to two, three, even four trainers first and they just weren't getting results and they finally ended up with Dion. We decided to skip all that time and money and effort and go straight to Dion as it was best for Gunner and our situation. We have had 4 sessions thus far and my wife and I have said multiple times that we wish we had done this as soon as we adopted. Dion doesn't just tell you what to do, he helps you reframe your perception of the relationship you have with your dog, and the reasons WHY things work and why things dont work. He trains YOU to become your dog's leader and then YOU train your dog. Anyone can teach a dog to sit or do simple tricks, but it takes someone like Dion who understands dog behavior and psychology to truly modify and reframe desirable and undesirable behaviors. I explained above that Gunner "was" all of these things and I used the past tense as he IS now a phenomenal dog. He's incredibly smart and with structure, rules, and effective tools and methods of communication, we have been able to build a fantastic relationship with him. He knows his place in our pack and we are able to lead him effectively. He is happier now and he has more freedom to join us wherever we go. He is no longer reactive on the leash or at our fence. He's at ease and calm even in chaotic environments, and he respects us and our heirarchy in the household. We get so many compliments on how well he's trained by the vet and people we see on walks all over town. Gunner was rescued from a kill shelter in Texas and we had run out of options. Dion helped us learn the tools we needed to be effective leaders and to create a happy home for Gunner and every dog to come after him. We can't thank you enough Dion!

Elias Lucero
5/5
We went through a basic puppy program which left us wanting more out of our pup and really left us with more questions than answers. We found Dion who has taken her to the next level - we were looking for a better heel, better focus, better obedience and overall more well mannere…Read full reviewClose full review

We went through a basic puppy program which left us wanting more out of our pup and really left us with more questions than answers. We found Dion who has taken her to the next level - we were looking for a better heel, better focus, better obedience and overall more well mannered dog, he delivered in just two sessions. Now we are eagerly looking forward to off leash work and giving our pup more freedom. We have only scratched the surface of it all! Thanks Dion!!

June Kirchner
5/5

I am pleased with Dion and the progress my dog is making. She is becoming such a pleasure to take out side.

Ashley Taylor
5/5
We’re about halfway through our program right now and we’ve seen really great results! Dion has been so patient with us and our 2 boys, especially because I have a ton of questions. He’s also been incredibly responsive via text and was very thorough explaining the tools we’d need…Read full reviewClose full review

We’re about halfway through our program right now and we’ve seen really great results! Dion has been so patient with us and our 2 boys, especially because I have a ton of questions. He’s also been incredibly responsive via text and was very thorough explaining the tools we’d need. I’ve struggled with training in the past and he does a great job of explaining to me why certain things that aren’t easy for me are beneficial and we’ve seen really great results. He also let my mom come to a session when she was in town so she could learn! I think my super stubborn pittie is actually enjoying having some structure, something I always felt guilty about! We’re very excited to continue the rest of their training with him and see even more amazing progress!

Original customer experiences from the collected Google data. Ratings without comments follow written reviews.

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