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Veterinarian in Fort Collins, CO 

If you live in Fort Collins or the surrounding area in CO, then you have picked the perfect site to find your pet's full-service veterinary hospital and activity center. Your pet is an important part of your family, and when he or she is ill, you want the best medical care available.

Welcome to Advanced Animal Care of Colorado

Your Veterinary Hospital in Fort Collins, CO
Call us at 970-493-3333


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The veterinarians and staff at Advanced Animal Care of Colorado are ready to provide your pet with cutting edge veterinary medical care. From preventative health and wellness care to advanced diagnostics and complex surgical procedures, your dog and cat will receive high quality care at our hospital.

Advanced Animal Care of Colorado is a full service animal hospital and will take both emergency cases as well as less urgent medical, surgical, and dental issues. We are proud of our state of the art facility and comfortable, inviting, sparkling clean environment where your pet can relax in the waiting room and look forward to meeting his or her own Fort Collins veterinarian.

Advanced Animal Care - Entrance at NightWe have a number of resources for you to learn about how to take better care of your pets. Our facility houses all your pet care needs from grooming and swimming to medical care, dog daycare, pet lodging and more. We invite you to browse the website and look at our articles and pet videos to get to know us better. We'd love to hear from you, so please call 970-493-3333 or email us, hospital@aacofco.com, and we'll promptly get back to you. We are very easy to find, and directions are available on our Contact Us page. You are personally invited to stop by for a tour of our facility at anytime - no appointment necessary!

Advanced Animal Care of Colorado & DOG TALES Activity Center will treat your pets like the valued family members they are.


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Meet Our Veterinarians

Learn Who We Are

  • Katie McCullough, DVM

    Dr. Katie McCullough grew up in the suburbs of Chicago. She obtained her undergraduate degree from DePaul University in 2009. After a couple of years of non-veterinary related work, she decided to pursue a career in veterinary medicine. She moved to Colorado in 2012 and graduated from Colorado State University School of Veterinary Medicine in 2016. She has practiced in Las Vegas, NM and Longmont, CO over the last 3 years. She has a passion for minimally invasive medicine, preventative care, surgery, and preserving the human-animal bond. One of her biggest goals is to keep your beloved pets healthy and with your family for as long as possible!

    Dr. McCullough lives locally with her husband, cat named Skippy, and dog named Emma. When she is not at work, you can find her enjoying the sunshine! She enjoys cooking, ready novels, traveling, trying new restaurants and breweries, and spending time with her pets. She is very excited to be joining the team at Advanced Animal Care!

  • Stephanie Beagan, DVM

    Dr. Stephanie Beagan was born in Honolulu, HI and grew up in Colorado Springs. At the age of seven, she watched her greyhound's surgery and told her mom that day she would become a veterinarian. Childhood summers were sent on the outskirts of a small Wisconsin dairy town participating in 4-H and harvesting a love for all animals. As a sighthound enthusiast, she melts for dogs with jobs. Her favorite job before veterinary school was working for a podiatry clinic as a medical assistant. While earning her Bachelor of Biomedical Sciences and Doctor of Veterinary Medicine at Colorado State University, she enjoyed participating in research, meetings for academic clubs, competing with her dogs, and attending social events. Dr. Beagan is most excited to start her practicing career in an establishment equipped to provide exemplary care. She first stepped foot in Advanced Animal Care of Colorado while an undergraduate and considered working here a dream job. When not in the clinic, she can be found spending quality time with her husband, friends, family, and pets (one cat, Zephyr, and foster greyhounds).

  • Tina Chen, DVM, cVMA, CCRT

    Dr. Tina Chen is originally from the suburbs of Chicago. She moved to Colorado to explore the beautiful Rocky Mountain region, and strives to keep her patients healthy enough to do the same. She graduated from veterinary school at Colorado State University in 2014. During veterinary school, she obtained training in Medical Acupuncture for Veterinarians, and she is also a Certified Canine Rehabilitation Therapist. Her professional interests include preventative care, rehabilitation, acupuncture, pain management, and internal medicine. She has had great success using physical rehabilitation and acupuncture to enhance mobility in her furry patients. In her spare time, she enjoys skiing, running, and exploring the mountains with her husband and their two dogs, Panda and Porter.

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7:00 am -7:00 pm


7:00 am -7:00 pm


7:00 am -7:00 pm


7:00 am -7:00 pm


7:00 am -7:00 pm


7:00 am -4:00 pm




Read What Our Clients Say

  • "We love our vet and feel like her medical knowledge is very good. Our sick puppy, Snickers, was well cared for by the staff when he was sick last year and now he acts younger and healthier than ever so we know they know what they are doing."
  • "The staff has always been amazing. They treat our pets and us so well. I love that they know who I am when I walk in. They go the extra mile to make sure our pets and myself have as good of an experience as possible."
  • "Erika and Dr. Alvillar we absolutely amazing with Hank. I recently adopted him and he was pretty scared. The gals sat on the floor with him to make him comfortable."
  • "Great facility. Great attentive staff. Great grooming department. Great daycare. Even a swimming pool!"
  • "Kayleigh, our dog’s groomer is the best. Roscoe loves her for a good reason. She and her assistant did an amazing job. We know how good she is because we started seeing her after a terrible experience at dog parlor"
  • "The grooming staff members are incredible! Nail trims are very stressful for my dog, but they work hard to make the process as comfortable for him as possible. It's a huge relief to know we can count on them for a positive experience."
  • "The staff are very friendly and helpful, the facility is clean and I always feel like my dog is safe and well cared for."
  • "We used the pool for the first time this week, and it was clean, we had everything we needed, and it was just an overall great introduction to the pool. We made an appointment for next week too!"
  • "I have never met a more caring, informed, well-trained and competent group of people. From the front desk to the energetic keepers of our dogs well-being I trust you all with such a level of knowing that you have your eye, ears and heart on Harley Pearl as if she were your own."
  • "The staff is always friendly and give a genuine feeling they care about my pup when I bring him in for doggy daycare."
  • "Our vet is very sweet and great with all of our crazy pups! The entire staff has been nothing but extremely helpful and kind to us!"
  • "My experience is perfect. More importantly however, it is Harley that is eager to jump out of the car, excited to see everyone, and is loved by her caretakers. If she were not, she would not get out of the car with such exuberance. Believe me when I tell you - she knows where she wants to go and where she does not want to go. Thank you to every single member of your staff."
  • "We love Advanced Animal Care of Colorado, we started bringing our black lab, Keira, here when we moved here from Florida and have never been disappointed! Great service every time, they always lay out options and recommendations, but never force extra tests/shots/etc on us. We get the final say, which I appreciate. We've gone to vets before where we were shamed if we opted out of a certain service, and that doesn't happen here. We got Keira spayed here just yesterday and Dr. Deramus did an awesome job! Keira is doing great! Thanks for taking such great care of our girl! We love AACC!"
    Brooke C.