About Mary

Hi there! My name is Mary and I'm committed to force-free, evidence-based training and streamlining the training process for you and your dog. While I work with all aspects of dog behavior and training, I specialize in fear, reactivity, and aggression.


My entire professional career has been dedicated to working with animals and my passion for helping dogs, keeping them in their homes, and improving their relationships with their humans has been demonstrated in a number of capacities.


I spent several years working as an Animal Care and Adoption Counselor, then as the Adoption Center Supervisor for the Massachusetts Society for the Prevention of Cruelty to Animals before relocating from Boston to Boulder in 2015 to pursue my passion for dog training and behavior at the Humane Society of Boulder Valley’s Training and Behavior Center. I also previously worked as a veterinary technician and in animal welfare legislation for the Humane Society of the United States.


When I am not working privately with clients, you might find me on deployment, working as a Professional Behavior Responder for the ASPCA’s Anti-Cruelty Behavior Team.


In my free time, I enjoy climbing, skiing, running, soccer, and taking my goofy adopted mutt, Buster on hikes in beautiful Colorado!



I earned a Bachelor of Science in Psychology and Biology from Northeastern University, with a concentration in Applied Behavior Analysis.


I graduated with honors from The Academy for Dog Trainers, where I earned my Certificate in Training and Counseling (CTC). Additionally, I am a Certified Professional Dog Trainer (CPDT-KA) from the Certification Council for Professional Dog Trainers.


I am a proud member of the Pet Professional Guild, whose mission is to support pet professionals who are committed to force-free, results-based, science-based ethical training and pet care.


Training with Knowledge and Compassion


Dog training is currently an unregulated industry in which anyone can call themselves a trainer, with no oversight or requirement for education, certification, or professional standards. This leaves you, as the dog owner, sifting through many different methodologies and approaches to training, including those that are outdated and unscientific.

So what do we know? Behavioral science has proven that pain and coercion-based training often elicits aggression as a side-effect. Science also tells us that fear and pain inhibit learning. The case for force-free, reward-based training is overwhelming.

I rely on modern behavioral science to guide my training methods, which is why I am a force-free trainer who uses reward-based methods. My commitment to you and your dog includes not only helping you achieve the results you’re looking for, but making sure you feel good about how you get there.

Collaborations with Dr. Marc Bekoff featured in Psychology Today:


More on how to choose a dog trainer:


(720) 526-2861

Proudly serving Boulder, Gunbarrel, Louisville, Lafayette,  Broomfield, Westminster, Golden, Arvada


Travel fees apply to Westminster, Golden, and Arvada. Please inquire for more information.


©2020 by Mary Angilly Dog Training.