blisters around mouth my dog

Question
what can that be

Answer
Geo, I have no idea. You did not provide enough information for me to go on, and without seeing your dog, it's nearly impossible for me to try and tell you what might be wrong. I would suggest that you call and talk to your vet about it.

If the blisters are on your dog's chin, and you feed and water him out of plastic dishes, that could be the problem. Change to a stainless steel dish for his food and water and see if the blisters clear up.