Our Doctors

Scott A. Flanagan, DVM

Dr. Flanagan graduated with honors from the College of Veterinary Medicine at Texas A&M in 1993. After graduating he and his wife Mylea, who is also a 1993 graduate of the Texas A&M College of Veterinary Medicine, moved to Ft. Worth and entered private practice at small animal practices in Benbrook and Lake Worth. They moved to San Angelo in 1995 to operate Southside Animal Hospital owned by Dr. Guy Sheppard. In 1999 they purchased Southside from Dr. Sheppard and in 2006 they merged with West Texas Veterinary Clinic and built the current facility. The Drs. Flanagan have 4 children ranging in age from twelve to twenty. They both enjoy living on their ranch with many dogs, cats, sheep, goats and one llama! When not working at the clinic, they enjoy family activities with their children as well as reading and outdoor sports. The Flanagans are also passionate about helping to strengthen and encourage other families and have been working with a family ministry called Winning Families based in San Angelo since 1999.

Lori N. Winkler, DVM

Dr. Winkler is an Associate Veterinarian and has been with Southside since July 2004. She is originally from Winters, Texas, and attended Tarleton State University before completing her DVM degree at Texas A&M University in 2003. Dr. Winkler’s veterinary interests include dentistry and managing animals with diabetes. She and her husband Davy have a young son. She was raised around horses, sheep, mules, donkeys and goats; worked at 2 mixed animal practices prior to veterinary school and she worked at one mixed animal practice prior to joining Southside. When not working, she enjoys cooking, spending time with family, reading and watching movies.

Mary Anne White, DVM

Dr. White is an Associate Veterinarian and has been with Southside since June 2009, starting soon after she finished vet school. She grew up outside of Baton Rouge, Louisiana, in Brusly and came to Texas as soon as she could to attend Texas A&M University for both her undergraduate degree in Animal Science and her Doctor of Veterinary Medicine degree. Dr. White’s veterinary interests include feline medicine, especially nutrition and behavior, and internal medicine and dermatology. She and her husband David have a young son and two tabby cats – “Zapps” and “Lily.” She grew up with numerous cats, one dog and spent school breaks on her family’s ranch in Columbus, Texas. She is also active in the Texas Veterinary Medical Association (TVMA). Dr. White served as a district director and the committee chair of the Membership Committee and received the 2014 TVMA Recent Graduate Practitioner of the Year. She and her husband are also active members of Sierra Vista United Methodist Church in San Angelo. When not working, Dr. White enjoys cooking, gardening, reading and spending time with her family.

Ilene F. Cooper, DVM

Dr. Cooper is an Associate Veterinarian and joined Southside in August 2015. She is originally from El Paso, Texas, but she and her husband Doug have lived in San Angelo for 21 years. She is yet another Aggie and received both her B.S. in Animal Science (1981) and her DVM degree (1986) from Texas A&M University. She and her husband raised their four daughters here and are now actively involved in the lives of their seven grandchildren. Dr. Cooper also loves traveling and camping. She has always had pets and passed that love to her daughters and grandchildren. Her current animal family includes 3 dogs “Reilly,” “Gracie Lou,” and “Buckwheat;” 2 cats “Grace” and “Niblett;” and 2 horses “Reno” and “Freckles.” When she’s not working, Dr. Cooper enjoys horseback riding, quilting and time with her grandchildren.

Theresa A. Feller, DVM

Dr. Feller joined the veterinary staff at Southside Animal Hospital as an associate veterinarian in July 2016. She is originally from Hermosa, South Dakota, and is a 2013 graduate of the veterinary program at Iowa State University. Her family includes her husband, Patrick, and their two dogs: “Winston,” an Old English Bulldog and “Thea,” a Vizsla. Dr. Henrickson grew up on her grandparents’ beef cattle ranch near Sturgis, South Dakota, and has practiced in both mixed and small animal practices prior to joining SSAH. Her veterinary interests include internal medicine. While not working, Dr. Henrickson enjoys outdoor activities such as kayaking, bicycling and backpacking.