If your dog is on a limited ingredient dog food you can use the individual ingredients as treats. For example, if she is on fish and potato allergy food, you can give her white fish pieces and potato pieces or even potato chips if the only ingredients of the chips are potato and salt.
You can also make biscuits from the canned allergy food (your vet may have to order the cans for you). Scoop the food by spoon onto parchment paper lining a cookie sheet. Bake at 250 deg F until hard. Usually one hour. Sometimes they must be baked twice to get really hard. In this case you would let them cool after the first baking and then place them in the hot oven again for another 30 minutes or so. You can make several batches since they keep for a long time in a covered or airtight container.
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