I used to be a DRY FOOD ONLY household until Snickers got all blocked up with urinary crystals! And I was told that the dry-only diet is what mostly caused it!!
So now they're on canned ONLY. No more dry. I buy the Authority brand from PetSmart and also, Iams canned (it's only a few cents more). They seem to prefer the Authority for some reason.
My Vet told me that an all-dry diet in an older cat is very very bad; they're just not getting enough water in their system. So I bought one of those pet fountains to coerce the cats to drink more & started them on canned food. It's a tad more expensive but I don't care. They love it & actually Zorro seems to be slimming down since I took him off the always-available dry food.
Or I think he's slimming down. He seems less thick.
And Snickers is still going strong so the canned food only is the way we're going to stay!