Chronic constipation and urniary tract infections are commonly associated with kidney disease. No matter how much a cat drinks his body doesn't asborb it due to bad kidneys. That's why they pee more because it goes right through them. Don't be afraid to do SubQ's at home. Have you vet show...
Constipation will cause clear fluid or foamy vomiting. As cats age they all eventually develop kidney problems which dehydrate the cat and cause constipation.
