Mine wasn't being given pizza. She would find it in the park, or scare a squirel into dropping a crust that had been taken from someone's trash. When she got old, that was enough of a reward for chasing a squirrel. LOL. I don't think she caught any her last two years.
Between the open trash cans in the park, and knucklehead neighbors who think plastic bags are a substitute for a closed can, the squirrels have plenty of opportunities...
I used to give my dog the last bite of my food before the "incident" in June, or any leftovers that weren't big enough to save.... He loves table food...