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My name is***** and I'm sorry to hear that Smooky is drooling and having problems eating.
This could be caused several different things-
-severe dental disease (rotten teeth)
-a tumor in the mouth, especially under the tongue
-cancer somewhere else, like in the stomach
-blockage of his intestines, either from a foreign body or a tumor.
I would recommend that you take him to your vet this week for an examination and consider blood work and x-rays if no answer is found with the physical.
Does this help? What other questions do you have?