From the link, which is terribly presented…

Join Pima Animal Care Center’s clinic staff as they bring their mobile medical unit, Karen’s Karing Van, to Summit Park, 1800 E Summit Street, to provide FREE services on May 1, 2, and 3! (7am to 2pm)

Available services:

On May 1: Check-in beginning at 7 a.m. (40 spots available): Spay/neuter, vaccines, and microchips. Large-breed female dogs will get first priority; other pets will be accepted based on availability.

On May 1, 2, and 3: From 7 a.m. to 2 p.m. (150 spots available each day): Vaccines, microchips, and wellness exams.

Vaccines provided will be FVRP and rabies for cats and DHPP and rabies for dogs.

This event is for Pima County residents only. Cats should be in carriers and dogs should be on leash. There is no limit to the number of pets one person or family can bring, but please be aware that you will be waiting in line and only bring the number of animals you can safely handle in that scenario.

Please plan to arrive early and wait in line.