Welcome to Green Valley Veterinary Services!

122 Atwoodville Rd
Mansfield Center, CT 06250
888-282-8632 FAX


Whether you have 2 goats, 5 horses, a dog, a cat, or 100 cows, the intention is to treat all of your animals as individuals that you the owner are greatly concerned about.  The vision of Green Valley Veterinary is to focus on the health of the animal through attention to environmental, nutritional, emotional/personality, and performance issues.  There is never just one approach or one solution to a problem, but rather there are options for each individual animal.  By providing you with alternatives, and information you need to make informed decisions, I help you choose the best medicine to meet the needs of you and your animal.


I am a mobile, primarily large-animal veterinarian based in northeastern Connecticut.  I serve eastern CT and western RI and my practice focuses on large animal medicine for almost all barnyard species, including cows, yaks, horses, donkeys, llamas, alpacas, goats, sheep, and pigs.  I have over 19 years experience providing routine care, including wellness visits, herd health and farm management consultations (pasture, housing, nutrition, etc.), as well as individual sick animal care.  I can provide routine care for your dogs and cats as well as home euthanasia services for your pets.  I have x-ray and ultrasound equipment with me at all times and I utilize two of the nation’s leading diagnostic laboratories for blood work, microbiology and general pathology needs. 

I am a member of and utilize the publications of the following organizations, attend yearly conferences, and belong to two on-line discussion groups, in order to remain current with changes in the profession:

           American Veterinary Medical Association

Connecticut Veterinary Medical Association

Rhode Island Veterinary Medical Association

American Association of Bovine Practitioners

American Association of Equine Practitioners

American Association of Small Ruminant Practitioners

American Holistic Veterinary Medical Association

Connecticut and Rhode Island Farm Bureaus


Throughout the year I frequently have veterinary or pre-veterinary students riding with me.  I have found the process to be mutually beneficial.  Not only do I enjoy teaching, but I learn from my students and stay up on the latest trends and techniques. 


Since I work on my own, my phone is answered 24-hours a day by an answering service.  They send me a text message for routine matters and call me for emergencies.  I encourage clients to contact me by e-mail as well. DrT@Greenvalleyvetservices.com   I try to answer routine questions within two to three days, but for issues that require more immediate assistance, calling and having me paged is preferable.


Emergency and after-hours coverage is shared with Dr. Jennifer Hall of Coastal Valley Veterinary Services, with whom I have an informal partnership.  Dr. Hall and I share a common philosophy and have known each other for several years.


I encourage you to look at this website to decide if I am the right veterinarian for you.  The information here is designed to introduce you to my approach to animal health.  You can click on the above tabs to find out more about who I am and my practice philosophy.  You will also find sections devoted to the specific animals I work on.  If after reading the information, you have a question of if you do not find the information that you are looking for, please do not hesitate to e-mail or call me.  I encourage communication because this ultimately helps your animal.



Dennis J. Thibeault, DVM