I know that dogs will lick themselves to clean up to a certain extent but one of my dogs licks too much. The second he lays down when he gets inside, he starts licking. He licks he paws, his stomach, his sides, etc. It's like he's a cat! He even acts like he's hacking up something a couple times a day and I wouldn't be surprised if it is due to hair in his throat. What could be causing this behavior? He has always been a big licker but acting so often like there is something in his throat has just been for the last few weeks. He gets flea treatment once a month and shows no evidence of fleas.