Cat Drooling A Lot And Lethargic. Most importantly, food provides a cat with energy. Could be a lot of things that cause lethargy.
By being aware of your cat's regular activities and his general healthy physical appearance, it will be easier to notice little changes and identify when he's sick. A cat may salivate or drool for many different reasons. A number of reasons can explain why your cat is drooling.
What sort of animal are we talking about?
I'll do all i can to help. Drooling in cats at a glance. Drooling occurs when saliva falls out of the mouth. In these cases, a bit of drooling is nothing to worry about.