A. Allergies are tricky. Allergic reactions can be very quick and show up very soon after ingesting something, however, stopping these reactions can take several weeks. If you switched to a new food it can take up to 3 months before you really know if it is helping, but the symptoms during this time may continue, they shouldn't be getting any worse. Removing histamines from the body is a slow process. If you think the problem isn't getting better then it is time to try another food.
If you're up for trying to figure out what the allergies are caused by, you can try an elimination diet. You basically take the dog back to 1 protein, 1 carb diet short term and when they begin to stabilize symptoms you start to re-introduce 1 new food at a time. I'm available for a private consultation if you would like some help with this.
A. It is impossible to guess which food will suit sensitive dogs without a food trial, being aware you may need to revert to previous food if signs recur. A hydrolyzed diet is most likely to be effective if you only have partial improvement
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