[Susan]

Hi Jenny,

look at “Natural Balance” LTD Sweet Potato & Bison formula, Sweet Potato & Venison formula..
https://www.naturalbalanceinc.com/dog-formulas/special-category-limited-ingredient-diets

You’re better off doing a food Elimination Diet this way you will know 100% what ingredients your dog is sensitive too, these salvia, blood & fur tests give false positives..
You have a small dog so home cooked or raw meals would probably work out cheap, just make sure diet is balanced after 1-2 months & diet is high in Omega 3 ingredients & oil for skin.

Look for a kibble or wet can food that has 1 novel protein & 1 carb & start from there…
also bath in a medicated shampoo, weekly or twice a week baths are best to wash off any allergens on their paws, skin etc
If you want to stay with vet diets look at the “Royal Canine” Select Protein, PR-Potato & Rabbit wet can & dry vet formula, the Natural Balance limited ingredient formula’s are similair & cheaper, there’s also “Rayne Canada” vet formula’s have Rabbit, Crocodile, Kanagroo.
http://www.raynecanada.ca/canine-diets/