I've volunteered for San Francisco's VET SOS (Veterinary Street Outreach Services) for over 6 years and despite all that time, each clinic I attend and photograph never ceases to blow me away. The intensity of the bond between the homeless humans and their animals rivals anything you've ever seen and, in many instances is life saving for one or both of them.
At these clinics, VETSOS's all-volunteer staff offers free veterinary service to anywhere from 30-60 animals belonging to homeless San Franciscans. If you're interested in getting involved or donating money or supplies, please visit the VETSOS website to learn more. Below are shots of clients and their pets from a recent clinic.