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It is a fact that parasites of all kinds are attracted to your dog and cat.

Parasites can infect both humans and animals. The most common parasites include:

External Parasites

  • Fleas
  • Ticks
  • Lice
  • Mites

Internal Parasites

  • Heartworms
  • Roundworms
  • Hookworms
  • Tapeworms
  • Whipworms

Prevention is an easy and cost-effective way to keep your pet and your family healthy. We offer a wide variety of products that are recommended and sold ONLY by veterinarians. Products we carry in-house or can be ordered online for your pet include, but are not limited to:


Flea and Ticks:

  • Bravecto - Chewable treat given every 3 months
  • NexGuard - Chewable treat given once a month
  • Vectra - Topical liquid applied once a month
  • Comfortis - Pill given once a month, fleas only


  • ProHeart* - Injectable given once or twice a year
  • Trifexis - Pill good for fleas, heartworms and intestinal parasites
  • Heartgard - Chewable treat given once a month
  • Interceptor - Tablet given once a month
  • Sentinel - Tablet given once a month, Flea sterilizer
  • Advantage Multi - Topical applied once a month for fleas and heartworms


  • Simparica Trio* - Chewable treat given once a month, protects against heartworm, ticks, fleas, roundworms, and hookworms

*Available for pickup at our hospital


  • Feline Revolution Plus* – Topical applied once a month for flea, heartworms, intestinal parasites and ear mites.

*Available for pickup at our hospital

Shop our online pharmacy

for all of your parasite prevention needs


It’s simple, intestinal parasites can be life-threatening to your pet and can even be spread to you and your family.

Intestinal parasite tests are recommended every 6 months to check for many forms of parasites that are undetectable by the human eye. These intestinal parasites can cause diarrhea, malnutrition, cause damage to their intestinal tract, anemia, and can even be fatal.

Due to there being many forms of intestinal parasites, the intestinal parasite exam will help our doctors know exactly which medicine to give if the test were to be positive. It will also help in which prevention to prescribe for the parasites that may be common in your area.


Heartworm combination tests are an important part of your dog’s regular health care because they detect a serious and life-threatening parasite. Heartworms are spread by an infected mosquito that you’re your dog causing major problems to their health. Our heartworm 4dx test not only detects heartworms but also 3 different tick-borne diseases that are commonly found in our area.

The faster we are able to diagnose your dog, the better chance we have of being able to treat the problem. Heartworms can be treated; however, treatment is very expensive, hard on your dog, and even you.

Heartworm disease in cats is very rare and at this time there is no cure for heartworm disease in cats. However, heartworms can still be life-threatening and cause damage to the lungs and heart. Knowing whether or not your cat as heartworms can help our veterinarians determine the best course of action in keeping your cat as comfortable as possible should they develop symptoms.

If you are coming in as a walk-in, feel free to give us a call to check the wait time before you come in. We look forward to seeing you soon!

Contact Us

Perrin-410 Animal Hospital


8365 Perrin Beitel Rd. San Antonio, TX 78218

Clinic Hours

Monday - Sunday: 7 AM - 11 PM Every other Saturday and Sunday: 7 am to 3 pm