Should I be concerned?

[Fourmat]

My Yorkie is very normal in almost every way, I think, but thereis something that is concerning me. He has the disgusting habit of licking up other animals' pee. When I take him out he almost always finds some pee to lick up, whether the pee is on the grass, or on the sidewalk. I have smelled the smell of stale pee on his face lots of times, but I just wonder if I ought to be worried...
He has eaten another dog's poop once or twice, but the pee is almost every time we go for a walk.