Our Staff

Dr. Mike and Technician Cathy

Michael O. Hayes, DVM - I was raised in Northern California, went to UCD as an undergrad and on to Vet School at Davis, graduating in 1982. I moved to Angels Camp and have stayed here ever since. I have raised my two children, Tommy and Chelsea in this environment and love the rural community Angels Camp offers. I like flying float planes, fly fishing, various organized sports and eating. Professionally I enjoy working with all species of animals and my interest is surgery especially orthopedics.

Dr. Ray

Raymond L. Sunseri, DVM - I arrived in Calaveras County in June of l980, soon after my graduation from the School of Veterinary Medicine at the University of California in Davis. At that time, I approached my career with a great deal of zeal and passion and after a little more than a quarter of a century later, I still enjoy my calling with the same amount of excitement and enthusiasm.

Mixed animal practice (large and small animal), by its very nature leads to a wide variety of cases on a daily basis, which keeps my interest and devotion to our practice at a high level. This amount of exposure over the years allowed me to pursue and improve my training in areas such as internal medicine, ultrasound, radiology, endocrinology, large and small animal surgery and large and small animal reproduction via the rigors of daily practice as well as continuing education. My formal training started at Cal Poly Pomona, where I obtained an AS degree in Animal Science. I left southern California to attend the University of California, Davis where I received a Bachelor of Science degree in animal science in 1976. Then it was on to the school of veterinary medicine, where I earned my degree in Doctor of Veterinary Medicine in June of l980.

My other passion in life is my family. My wife, Alice, and I enjoy 5 children and 6 grandchildren along with a menagerie of pets, both large and small. We live in Angels Camp, which I have considered my home since the day I arrived over 27 years ago.

Dr. Tom and Family

Thomas A. Heermance, DVM- I received my D.V.M. in 2003 from University of California, Davis. I grew up in Palo Alto, California and attended Whitman College in Walla Walla, Washington. My wife Ali and I moved to Calaveras County in the summer of 2003 and I have worked at Angels Camp Veterinary Hospital ever since. I have a special interest in surgery and internal medicine. My wife and I live in Vallecito with our daughter Addison (6), and son Peyton (4). Our animal family evolves constantly but at the moment includes a donkey, goats, chickens, dogs and cats. Hobbies outside of veterinary medicine include fun at Bear Valley in the winter and New Melones lake in the summer.

Dr. Lauren

Lauren Hobstetter , DVM - I was raised in the Bay Area where I grew up with the dream of someday becoming a veterinarian and living in the country with horses in my own backyard. Moving to Angels Camp has allowed me to realize these two lifelong dreams. I moved to Portland, Oregon for my undergraduate studies at Lewis & Clark College where I graduated with a BA in Sociology and Anthropology. I spent a few more years completing pre-requisites for veterinary school at Portland State University and then attended the Oregon State University College of Veterinary Medicine (Go Beavs!) for my veterinary education. My professional interests include internal medicine and pet hospice care. Being a veterinarian is fulfilling because it gives me the opportunity to build meaningful relationships with pets and their people; I'm fortunate to call this my profession. My partner and I share our home with 3 dogs, 5 cats, and 2 horses. When I'm not at the vet hospital, you will find me with my animals, horseback riding, spending time with my family, or taking care of our ranch.

Dr. Alyssa

Alyssa Thomas, DVM - I was born and raised in central Missouri in a rural community. I received my BS in Animal Sciences in May of 2013 from the University of Missouri. While there I was a member of Sigma Alpha professional Agricultural Sorority, president of Pre-Vet Club, as well as competed on the National Livestock Judging Team my junior/senior year. I attended the College of Veterinary Medicine at the University of Missouri and graduated in May 2017 with my DVM. I was very active in school, serving as Class President, President and co-founder of the Theriogenology Club (study of reproductive medicine), fundraising chair for the Missouri Mule Team (our college mascots, Tim and Terry, who are pictured above), served as the National American Association of Bovine Practitioners representative for our college, and was involved in American Association of Equine Practitioners club. My passion is reproductive medicine, particularly in cattle, horses, and canines. I am AI certified and have training in palpation/ultrasounding. I love large animal medicine and my idea of a perfect day is going out on farm calls from dawn till dusk. I also enjoy surgery in all species; I'm always up for a challenge! In my free time I like to ride horses, workout, read, and explore my new home state California. I currently live with my boyfriend, who is an MD, and our cat Sansa. I hope to someday own my own horse again as well as find some land to raise cattle on.

Dr. Sira

Sira Segarra, DVM - I was born and raised in San Juan, Puerto Rico. After finishing my Bachelor’s degree at the University of Puerto Rico, I went off for a new journey at Ross University School of Veterinary Medicine in St. Kitts and finished my last year of vet school at UC Davis, graduating in 2017. My favorite aspect of being a veterinarian is that every single day I get to be passionate about my work, about my patients and their relationship with their families. There is nothing more rewarding in life than being a witness of love and compassion. Internal medicine, surgery and oncology are three areas of veterinary medicine that captivate and intrigue me. During my time off, I love spending time with my family, friends and of course, my dogs. Large breed dogs are my absolute favorite, I have a special bond with Rottweilers, but I also enjoy working with small dogs, cats, horses and small ruminants.