Trap-Neuter-Return (TNR) is the process of humanely (non-lethally) trapping feral cats to have them spayed or neutered, vaccinated, ear-tipped* and returned to where they were trapped.

PHS offers free spay/neuter, vaccinations (FVRCP and rabies), and ear-tipping for feral cats throughout our animal control contract cities: Altadena, Arcadia, Bradbury, Glendale, La Cañada Flintridge, La Crescenta-Montrose, Monrovia, Pasadena, South Pasadena, San Marino, Sierra Madre and Unincorporated Pasadena. There is a $30 fee for TNR requests outside of our contract cities. Additional services such as FeLV/FIV testing and microchipping are available upon request for an additional cost. A small inventory of humane traps are also available to rent for a deposit of $80, which is fully refunded upon return of the traps within 30 days.​ ​Notify the SNiP Coordinator if you need a humane trap.

Contact our SNiP Coordinator at for more information or to schedule an appointment. Because of the high volume of requests we receive it may be a few days before someone can contact you.

Please do not schedule your pet cat or an owned cat through the TNR program.

Program Hours: Tuesday through Friday between 8am-4:30pm, but you must have an appointment in order to participate. Cats brought in without an appointment may not be admitted.

Information about Feral Cats

What is a Feral Cat?

A feral cat is an outdoor cat that has not been socialized by people and requires "trapping" to bring it to a veterinary facility. Feral cats live outdoors in groups known as colonies. These colonies can survive on their own but their lives can be improved immensely by a regular "caretaker."**

Feral or Stray?

Feral cats will not allow you to approach or handle them; they need to be humanely trapped in order to bring them to a veterinary facility. A stray cat will likely approach you and is likely to be vocal. A stray cat that has only been coming around for a few days should be given the opportunity to find its way back to his owner, and so it is best not to feed or trap it during this time.

Can’t we just trap and remove all the cats?

Simply removing cats from an area opens up an ecological void (also called the "vacuum effect") which more cats will likely fill and a new cycle of reproduction will begin. If the colony is sterilized and monitored by a "caretaker" the cat population should stabilize and gradually decline over time.

Additional Educational Resources

*Ear-tipping: All feral cats brought to our clinic are "ear-tipped" while under anesthesia and it is done for the health and safety of feral cats as it prevents needless trapping and surgery. The veterinarian makes a straight cut across the ear with a scalpel or laser, and there is little or no bleeding.

**"Caretakers": Individuals who accept responsibility for caring for the colony – not just leaving out food, but ensuring every colony member is sterilized, vaccinated and monitoring the colony for newcomers, injuries and illness.