My dog drinks his own pee!

I have a 7 month old yorki-poo who is neutered. I have noticed recently that when he pees, he sticks his head under his body and drinks a little pee. Just a taste though. What is this all about?

Thanks.

Hes just cleaning his weinie area. My dog does it almost everytime he pees.Hes just licking the pee thats making his fur on his weiner wet.