Is it bad to eat the guinea pigs treats?

My kid LOVES pet food. Let me start by saying we keep Logan gated innto the living room or else he would be into everything. So whenever we are about to go somewhere I open the gate and instead of running to the door he always makes a pit stop at the dog food, and always eats a big handful. Now if you've ever smelled dog food it stinks and I don't imagine it tastes any better than it smells. And the truth is I dont ever wanna learn if it tasts like it smells. But for one reason or another Logan loves it. So a while back I thought maybe he just does it to get a rise out of me, nope b/c I stopped making a big deal out of it in fact I dont say anything at all and he still does it every time. A big handful of dogfood right into the mouth. Well today I catch him eating the guinea pigs treats. I just dont get it, it cant possibly taste good. To tell you the truth it just grosses me out and I like some very wierd food. But anyway happy eating Logan!