Since 2013, Sam Kovac has devoted time and money to helping animals who live on the streets.

In an initiative called Project HoPe, the young vet offers check-ups, vaccinations and complex surgery at his two Sydney clinics, free of charge for those in need.

Dr Sam Kovac, with dogs Pepe and Pearl Von Stein, in one of his pet ambulances. Credit:Brook Mitchell

About a year ago, as he treated a dog with ligament problems, he realised he was in a unique position to help the owners of pets as well.

The dog's owner visited with his pet frequently, and in the process divulged he was homeless, long-term unemployed and had psychological issues.