Hi, for some reason my dog has been struggling to drink over the last couple of weeks. He is eating fine but seems to lap about 3 or 4 times then pulls away and opens his mouth (as if he's bit his tongue or lips, although I don't think this is what he's actually done), and licks his chops alot. He will go back to drink more but does the same again. I have been to the vet and showed them videos and explained but they are baffled and don't know what it could be, which isn't helpful. Myself and tge vets have checked his mouth, teeth and tongue but there's nothing noticeable. Hes only 4, so still young. Has anyone else experienced this or know what it could be?