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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
Charlene
5/5
Dion is a master as his craft. I’ve tried dog training before which didn’t help with the issues I wanted to focus on (pulling on walks, jumping at people when excited to see them come into our home etc), so I was a bit jaded. Coming to Dion was a huge win for us. Banner and Harl…Read full reviewClose full review

Dion is a master as his craft. I’ve tried dog training before which didn’t help with the issues I wanted to focus on (pulling on walks, jumping at people when excited to see them come into our home etc), so I was a bit jaded. Coming to Dion was a huge win for us. Banner and Harlow did a great job with the training program. We can take them on walks without getting the “who is walking who” line we all loathe to hear. They aren’t trying to pull us across the street to other dogs to say hi. Walking these 70LB dogs is now an enjoyable experience verse one that used to be riddle with anxiety (not bc they are bad dogs but not everyone loves a Pitbull coming over to say hi). Thank you Dion for being patient with us and making sure we can enjoy our walks, patios and future hikes with the pups!

Sierra Gonzales
5/5
I couldn't recommend Dion at Ancillary K9 more! We came to him with a 16 week old male German Shepherd puppy and a 4 year old female GSD. Our 4 year old was quite reactive to other dogs and we wanted to get our puppy on the right track as soon as possible, as well as having him t…Read full reviewClose full review

I couldn't recommend Dion at Ancillary K9 more! We came to him with a 16 week old male German Shepherd puppy and a 4 year old female GSD. Our 4 year old was quite reactive to other dogs and we wanted to get our puppy on the right track as soon as possible, as well as having him trained as a protection dog. Having working breeds, we also wanted to ensure our dogs were getting the right stimulation and attention to their needs. To say that Dion helped us completely change our dog's behavior would be an understatement. Our 4 year old is no longer reactive to other dogs and our puppy is the best 8 month old puppy I've ever come across. Every single time we go out with the dogs, whether that's on a walk in the park or to a restaurant, our dogs are the best behaved dogs out there by a long shot. I couldn't imagine having gone to any other trainer, I just know we would not have gotten the results we wanted. We recommend him anytime someone even mentions dog training. We'll be continuing to work with Dion for a long time, not just on obedience but on higher level training as well. 1000% worth the investment.

jussepen
5/5
I had a really hard time with my dogs on a leash and them listening to basics commands. Walking them was more stressful than calming. I had tried various YouTube methods and different types of techniques - no pull harness, gentle leader, etc. After all the sessions with Dion my d…Read full reviewClose full review

I had a really hard time with my dogs on a leash and them listening to basics commands. Walking them was more stressful than calming. I had tried various YouTube methods and different types of techniques - no pull harness, gentle leader, etc. After all the sessions with Dion my dogs are different ! They listen to the basic commands and walking them is another story ! I’m glad we went through this journey with Dion and here are some pictures/videos while training so they may not be perfect but they’re doing much better.

Richard3826
5/5
Dion is the 3rd dog trainer I’ve gone to and far and away the best. I came with a dog who had minor obedience training but would freak out if I ever left him alone. I couldn’t leave my apartment without him howling incessantly which led to noise complaints from my neighbors. I ex…Read full reviewClose full review

Dion is the 3rd dog trainer I’ve gone to and far and away the best. I came with a dog who had minor obedience training but would freak out if I ever left him alone. I couldn’t leave my apartment without him howling incessantly which led to noise complaints from my neighbors. I exhausted EVERY tip and trick you can find on a Google/youtube search to help with this but nothing would stick. Within 2 weeks of guidance and training sessions at Ancillary K9 (more for me than my dog), Dion taught me how to be a proper leader. I’m able to leave my apartment without any howling and feel like I have my life back. It’s amazing how much Dion is able to pack into a 1 hr session that clicks. He listens and directs appropriately all while following an easily repeatable process. I’ve learned a lot and couldn’t be happier to continue working with him.

Kylie St.Clair
5/5
After several months of trying to find experienced trainers, I finally came across Dion. It was so hard to find someone who not only knows how to help me and my dog, but also did not look down at me for being so young. Dion has always been firm, with both my dog and me (trust me…Read full reviewClose full review

After several months of trying to find experienced trainers, I finally came across Dion. It was so hard to find someone who not only knows how to help me and my dog, but also did not look down at me for being so young. Dion has always been firm, with both my dog and me (trust me, we need it) but he has never been harsh or unkind. Since the first time I met him, Dion has always cared about not only my dog’s wellbeing, but also mine. I can’t tell you how many times he has offered me an extra pair of gloves or a jacket just because he thinks I am too cold. He is also very personable and you can tell he really listens, and remembers, when you tell him things. Before coming to Dion, Spike, a decently large German Shepherd, would drag me everywhere, pull me towards other dogs, and growl at people when they would walk by. After the first session of training, Spike no longer pulled me on our walks, but would nicely heel right beside me. Dion helped me teach him how to be patient and gain self control, by teaching him how to sit and watch (he can sit and wait both on and off leash now). Now, after 5 sessions, Spike will heel his whole walk, he can ignore other dogs, and he will nicely walk past people. Not only this, but with Dion’s help, and a lot of practice, Spike can also play ball and heel off leash. Not only has he helped me with the bad habits I knew Spike had, but he has also pointed out habits that I didn’t even know could be an issues. He doesn’t just point them out, but he explains how to fix the behavior, and real world examples of how the behavior could be an issue. I would not have been able to do any of this without Dion’s help. I would definitely recommend him if you and your dog need help.

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

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