My dog is 10 years old. She is part sharpe, pit and rotwollier. She has always had psyorisis. Her legs and feet have started swelling with water blisters that have a lot of fluid. She has rashed out more on her belly and legs like she has been biting. When the blisters occur she constantly licks them until they bust.

She must be in extreme discomfort. Take her to the vet and have her taken care of.

I don't know what you want us to say about this; we can't diagnose or treat an animal on line.