
This is something I feel particularly strongly about. More isn't necessarily better and RC is one I'd swerve for sure, unless I had a small breed dog who do tend to need a higher level of protein. For me, with my Bassets, I think 26% protein is about the highest. I bought one, my most recent buy in, who'd been reared on RC Junior which I think, is 32% protein. I'd never rear my B.Puppies on anything like this level, and didn't. It might have been going to happen with him as it's not unknown in the breed, but he was lame by around 8 months (we bought him at 4 months, and switched him to something with a lower protein level almost immediately). I immediately went to Pano but after full front to back x-rays, turned out he had premature closure of the growth plates, ulna on both sides. The lameness stopped, but he was left with too much turn out in the front, even for the breed!!! Resulting in my plans to get back into the ring being aborted which was sad as he was/is otherwise a lovely boy. Just not what I'd have been happy to show.
Again he may have been going to have this without the food, but again 32% protein is, for me, with the breed, way too high. Again more isn't necessarily better. Especially with the bigger breeds. Slow and steady with growth is for me, always the best.
Add - I have used Burns in the past, to good effect. However I believe the company has now been sold - certainly it's not getting the good press it once did. Mine are on Arden Grange, Sensitive - in addition to his growth problems, my Basset came to us with GIARDIA - my first experience with this - and his tummy has tended to be 'sensitive' ever since, even now he has negative fecals.