Pre-Operational Instructions

For puppies & kittens under 5 months of age and under 5 pounds: Do not withhold food or water. You may feed them a small breakfast (about ~1 tablespoon) the morning of their surgery.

For dogs and cats over 6 months and over 6 pounds, pick up food at 10pm the night before his or her surgery.  Water is ok to give. If your pet is not fasted, they may be denied surgery or be required to receive an antiemetic to prevent vomiting and aspiration.

  • All pets must be at least two months of age.
  • All pets must weigh at least two pounds.
  • All dogs must be on a leash.
  • All cats must be in a carrier (or trap if feral).

Your pet will be ready to be picked up starting at 4:30 pm the same day. We will give you a brief overview of post-surgery instructions, and send a written version home with you.  

Your pet will be given pain medication before and after surgery that will last up to 24 hours after surgery. If you feel your pet is painful after 24 hours, please call us for a courtesy recheck-we can dispense additional pain medications if needed.


Your pet’s health and safety is our biggest concern. If our veterinarians and staff refuse to perform surgery on your pet, it is because your pet has a health or safety issue that is too high risk for surgery. We may also refuse to perform surgery on highly aggressive animals if we feel they are a danger to our staff. This does not include feral cats in approved traps. Please try to understand that our main concern is always your pet’s health and safety.

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About SAHS

The San Antonio Humane Society (SAHS) is a 501(c)(3) nonprofit, no-kill organization that has served Bexar County and its surrounding areas since 1952. The SAHS shelters, medically treats, and rehabilitates thousands of dogs and cats every year.

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