I don’t think it matters which protein you choose, just go with one he’s never eaten before. You can give treats, but it should be simple single ingredient with just the protein you’re feeding him. So say you go with goat, any treat you feed should be just goat nothing else. Just during the period of time that you’re trying to figure out what his food-triggers are (if there are any). If you’re feeding, say, a raw diet with goat and starting giving a biscuit that has chicken and carrot and sweet potato and peas then he has a reaction, you would have no way of knowing if the reaction was caused by the goat, the chicken, the carrots, the sweet potato or the peas – you know what I mean? So during the ingredient trial period simple is best. Once you get past the 2-3 month period and start re-introducing other foods and figure out which (if any) ingredients are triggering his actions you can buy treats with safe ingredients – but before you can do that you need to figure out which ingredients are safe. And as, as I said in my previous comments, I would strongly encourage a high quality pro-biotic supplement (Mercola’s and Garden of Life’s Primal Defense are two of the best) because, like Toxed just pointed out, a healthy gut is the foundation of immune health.
