I seemed to recall hearing about high protein diets possibly causing stones. Carnivores eating fresh meat would get lots and lots of water from the meat itself (something like 80% water, I think). Kibble doesn't give that.
I did some poking around online, though, and it seems there are several different types of stones, some of which could possibly be worsened by high protein, but others that are more likely to be caused by chronic UTI's or other issues.
So I guess it's possible it's diet, but could be totally unrelated. Also, TOTW has some high-protein formulas and some average-protein formulas, so I'm not sure which one Frank is on.
25% protein certainly isn't high, I agree.
My roommates cat has a history of urinary tract problems, so I looked up a lot of info in cats so I'll tell you what I know about cats, though it is basically what Beth said. Maybe the same applies to dogs? Basically, cats get UTIs and stones and crystals because they are supposed to be getting their water from their diet. But, cats fed dry food aren't getting that because it's dry! That's why its recommended to feed your cat wet food daily-- to offset the water loss by feeding dry food. The animal does not know how much water to drink to replace the missing water from its diet, and then these problems arise because there is not sufficient water for processing. Dogs drink much more than cats (per unit of body weight, or so I've noticed), so these problems would be less apparent in the dog. Maybe Frank is on the borderline of not drinking enough to make up for the dry food? As for it being TOTW specifically, maybe there is an ingredient or several ingredients that require more water to break down.
Edit: In case you were wondering, my roommate's cat's problems were cleared up by switching him from purina dry food to Wellness wet food in the evenings with a small amount of Wellness dry food in the morning. The vets couldn't figure it out, but at my suggestion she switched food and now she has 100% less vet bills! My one success story, haha.
Wow. Good sleuthing! I recently switched from TOTW to Orijen, for kibble. But I also add various types of meat to my dog's diet; sometimes raw, sometimes cooked. Like Melissa, I like to just put kibble in the ball - keeps him occupied & slows down that piggy pembroke eating process!
Rachel what you're saying makes sense too, as on some of the raw sites they talk about not feeding raw & kibble or cooked together in the same meal as their digestive systems handle each a little different. hmm, a bit to think about.
Thanks for sharing this info & your insights, all of you!!
Yeah, I feed Waffle Orijen when I'm feeling lazy and/or he looks bored. I got him a Wobble Kong for it; he loves that thing.