Preference for specific protein source
When you know your pet prefers a particular type of meat, it can both limit and makes your selection process easier.
Since you’re limited in the variety of foods that can be fed, you will be limiting the spectrum of nutrients that is available to your pet to a certain extent. A nutritional supplement may be helpful in these cases.
Since you now can confine your options to foods with a specific protein source, your choices are dramatically reduced. Consider foods that are dissimilar to what you’ve used in the past which caused problems.
Beef based foods used to be popular until dogs developed sensitivities to it. Chicken is now the most common protein source. Lamb formulas were introduced to address sensitivities to Chicken. Now that it has become so common, we’re seeing more and more dogs with allergic reactions to Lamb.
Keep in mind that just because a food is touted as “hypo-allergenic”, your pet may not tolerate that particular meat. You can now find foods based on Duck, Elk, Kangaroo, Unagi, Rabbit, Venison and others. The chances of a sensitivity arising with these “novel” proteins is usual, but possible.
If you know you’re limited to a specific meat, consider rotating with different manufacturer;’s formulas which are based on that meat. This will provide a bit of nutritional variety for your pet, without the risk of incorporating the meats that are not tolerated well.