My past experience with both a CAT and a DOG... suddenly urinating a lot... drinking a lot.... etc was that of diabetes... I finally had to get the BOX(s) of SMALL(not large) diabetes needles and inject them twice a day with a small amount of Insulin(which I purchased at Sam's Club).....

NOW...the dog urinating in the house all of a sudden.. That could be caused by either(or both): a) the onslaught of diabetes and/or b) if you recently left your doggie in a kennel. Leaving a dog in a kennel forces them to urinate and doo-doo IN their kennel so when they go HOME, they carry that temporary trait with them so they have to be re-trained to go outside when they want to do their business.

Diabetes is not the end of the world but the problem is giving them injections twice a day...whatever you do (if you have to start giving injections) is to buy the big box of SMALL NEEDLES....