The Cornelius Clinic provides affordable, vaccination and other basic pet wellness services that will protect your pet against common health threats. 

help vaccinate


Saturdays only from 9:00 am to 3:00 pm

*Walk-In Basis Only* No Appointments Necessary   


17555 Katy Fwy, Houston, TX 77094 - Look for The Cornelius Clinic building southwest of the main shelter building. We do ask that you do not walk your dog in the park area as the shelter animals are walked in that area each morning and afternoon.


See fee schedule for dog / puppy vaccinations and cat / kitten vaccinations

Notice : Prices may change at times due to product manufacturer increases.


Due at time of service. We accept Cash or Credit/Debit Cards (no checks)

What to Bring

  • Your pet's prior vaccination record from other clinics
  • Consider printing & filling out our Release Form.

Clinic Policies


The CAP Vaccination Clinic does not provide treatment for sick, heartworm positive, or injured animals. Please see a full service veterinary clinic for these issues.

Dogs must be on leash/in carrier. Cats must be in carriers (cardboard carriers are available for purchase for $5). We ask that you do not walk your puppy/dog in the park area, as shelter animals will be having their morning walk in that area. Please do not place puppies under 4 months of age on the floor inside or outside.

In order to purchase heartworm medication, dogs must have been seen by our vet within the last year and be heartworm tested either:

  • at 6 months of age if not on prevention
  • at annual visit during 2nd rabies vaccination if on prevention since 2 months of age
  • at annual visit as an adult


Your pet will receive a basic examination by the veterinarian which includes an examination of the skin, eyes, ears, mouth, teeth, temperature, and overall body. If minor health issues are detected, such as fleas or parasites, the veterinarian can suggest medication for treatment. If the issues are more serious, you will be instructed to take your pet to a veterinarian. In addition to vaccinations, the Wellness Clinic offers:

  • Heartworm test for dogs 6 months and older
  • Microchipping through 24Petwatch network
  • Nail Trimming
  • Preventative Heartworm/Flea & Tick Medication

Online Pharmacy

Are you a current client of the vaccination clinic?  If so, take advantage of ordering your flea & heartworm medications online.  Visit our Online Vetsource Pharmacy today!  All proceeds from online purchases go back to helping shelter animals.

If you prefer to purchase your medications from another online 3rd party such as 1-800-Pet-Meds or Allivet, please be aware that approval for such prescriptions may take several days due to vet rotations.  However, purchases through the CAP Vetsource Pharmacy can be approved within 24 hours or sooner.

Vaccination Laws

State law requires all cats and dogs to receive a rabies vaccination by age 4 months. If your pet has a current rabies vaccination, you must show proof with a valid rabies certificate. Unvaccinated animals 3 months and over will receive a rabies vaccination at the owners expense.