You should be very careful about using Deramaxx. Here's a thread where someone's dog just died from kidney failure due to it.
http://www.yorkietalk.com/forums/sic...ad-3-days.html There are links in that thread to all kinds of good info about this drug. There are some good supplements available that are safe to use. I use Nature's Logic for my dog food but it is a kibble and is around 36% protein. Many folks here recommend Wellness, Orijen, Artemis etc. You want to avoid a food that has a lot of filler in it. The common things to avoid are wheat, corn beet pulp and especially meat by-products.