Hi my dog for awhile has been suffering from a urinary tract infection, we took him to the vet and they said he had a bladder stone. They said that they could give him medicine for it, and then we would buy some special food only sold by vets to dissolve the bladder stone. Only, we didn't immediately because the food cost so much. A month later and his urinary tract infection was back so we bought the expensive food but now he won't stop drinking! He once sat at the bowl for three minutes, drinking and drinking. He drank so fast the other night the bowl started to shake. Is this a result of the medicine in the food? Is this the way it breaks down his bladder stone?