I had Czari on Prozac for about 6 months. The first few weeks she was on it, she was very wary and it did take a while for it to get into her system. I imagine he'll be okay with a few more days. You should check places that sell ready made raw. I know one of the places I buy my gangs food sells Nature's Variety Raw food, and they have small packages that cost around $4. If you can get that then you can see if they will like it and nto pay a lot. But, I can tell you from my own gangs experience, it takes a while. My little guy Maks at first loved it, then stopped eating it. His sister, Kiska, wouldn't touch it, but I put some down not long ago and she dug in.