@ Mary Lynn L
Just go with the prescription food that I assume your vet recommended. It’s hydrolyzed, therefore the ingredients don’t matter as your dog will not react to them.
Don’t know what you mean by “allergy shots” but that sounds like treatment for environmental allergies.
I would have a serious talk with your vet. Does your dog have food sensitivities? Food allergies? Environmental allergies?
A combination of two or all three or just one?
Also, have you considered consulting a veterinary dermatologist? They treat allergies and are the best regarding testing/diagnostics and what would be best for your specific dog.
