[Susan]

Hi when I rescued my boy he had crystals he was put on the Royal Canin S/O Urinary wet & dry for 6 weeks…. within 6 weeks all his crystal had dissolved, he had another ultra scan done at 6 weeks & crystals were all dissolved & gone…
The fat is pretty high in the Hills formulas 22.6% dry kibble, the Royal Canin S/O dry kibble is 17% fat, Hills have a better range in the K/D wet tins formulas.. Wet tin’s are best for kidney problems….with the dry kibble they MUST drink water & if your dog isn’t a big drinker of water then kibble isn’t a good idea…
I don’t know if your boy is OK with higher fat diets, but as they start getting older some dogs do better on lower fat diets…