Rockhill Veterinary Associates

Is this your veterinarian?

3210 State Road
Sellersville, PA 18960

Driving Directions

(215) 257-6515


  • Hours:
  • Mon-Fri: 8:00 AM-8:30 PM
  • Sat: 8:00 AM-12:00 PM
  • Sun: Closed

At Rockhill Veterinary Associates, we understand that your pets are an important part of your life. Our highly trained staff will treat you and your pets with professionalism and courtesy while providing you with the very best veterinary care available. Our full-service practice offers a variety of services intended to promote your pet’s overall health and longevity. It is our privilege to care for you and your pets, so call today to learn about our services or schedule an appointment.

Rockhill Veterinary Associates Services

  • 24-Hour Animal Hospital
  • Acupuncturist on Staff
  • Behavioral Medicine
  • Blood Transfusions
  • Boarding
  • Cardiac Specialist
  • Dental Care
  • Emergency and Critical Care
  • Fully Stocked Pharmacy
  • Grooming
  • Hospice and Euthanasia Services
  • House Calls
  • Laser Therapy
  • Microchipping
  • Nutritional Counseling
  • Orthopedic Boarded Surgeon on Staff
  • Pain Management
  • Parasite Prevention and Control
  • Puppy and Kitten Care
  • Radiology (X-Rays)
  • Senior Care
  • Surgery
  • Ultrasonography
  • Ultrasound
  • Vaccinations
  • Wellness Exams

Rockhill Veterinary Associates Staff Profiles

Dr. Robert A. Mowday Jr.

Dr. Robert Mowday received his Bachelor of Science degree in 1977 from Ursinus College. Dr. Mowday studied at West Chester State University for Graduate studies in Biology from 1977-1981. He received his Veterinary Degree in 1985 from the University of Pennsylvania. Dr. Mowday has been a senior staff member at Rockhill Veterinary Associates since 1986.

Dr. Mowday has a passion and vast knowledge base for Veterinary Medicine. He has treated a wide variety of patients along with a wide diversity of cases. His experience includes a broad range of medical cases, surgery and emergency. His takes particular special interest in Oncology, Soft tissue surgery and Emergency and Critical Care.
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Dr. Stefanie Lin

Dr. Stefanie Lin received her Bachelor of Science degree in 1988 at Bucknell University and received her Veterinary Degree in 1992 from the University of Pennsylvania. She completed a year Internship at the University of Pennsylvania ending in 1993. Dr. Lin has been a senior staff member and practicing Veterinarian at Rockhill since 1994.

Dr. Lin enjoys time with her two dogs and 3cats. Cedar is a “rescued” German Shepard mix and Ivy. Her 3 cats include; Clover, Shadow and Meadow. Dr. Lin has a particular interest in General Surgery. When not practicing Veterinary Medicine, she takes pleasure in family events with her husband, Andy and two children, Avery and Drew. Her other interests include: Gardening, horseback riding, skiing and her children’s sports.
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Dr. Thomas Derstine

Dr. Thomas Derstine received his Bachelor of Science degree in 1970 from Muhlenberg College and his Veterinary Degree in 1974 from the University of Pennsylvania. Rockhill was established in 1955. Dr. Derstine has been practicing veterinary medicine at Rockhill since 1974.

Dr. Derstine enjoys all aspects of pet care but has special interests in Dermatology, Ophthalmology and Surgery. When not practicing medicine, Dr. Derstine enjoys spending time with his wife and 2 daughters. He also enjoys discussing cases with his oldest daughter, Dr. Jennifer Derstine. His other interests include: fishing with Granddaughters (4), water sports and traveling. Dr. Derstine has one cat, Whitney.
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