Yes, years ago our darling old Kurt, a Doberman, started creeping around kind of bent over. He had a bladder infection, antibiotics and LOTS of water. LOTs and lots of water was what the vet told us. Many dogs, and people too, don't drink enough water to wash out all the crystals that form in the bladder.
Water. More water. Praise him for "going" and try to take him out every half hour or so. Lots of praise.