[anonymous]

I would try to obtain a urine sample and take it in to the vet. Has he had a senior checkup recently, if not that would be the direction I would go in.

There are no veterinarians here at DFA. Any comments would just be speculation and opinion.
Taking the wrong advice could result in a delay for the dog getting a correct diagnosis and the right treatment.

PS: I doubt foamy urine has anything to do with the food.