I just switched foods and am going thru the same thing...paw licking, itching and tear stains. I'm not sure if there is a period where once they get used to the food will the initial allergy signs wear off? Hope someone can answer this for me or should I put them back on what they were eating before STAT! I also read an article about more itching during the winter months because of the dry air from the heaters running and the winter weather. Also, you have to consider when they go outside they may pick up some allergens too. Use baby wipes to wipe them down after coming in from outside. Is your baby on a vitamin? This helps their immune systems which can go down during stressful situations. I'm sure you'll get some great responses soon. Hope your baby gets better soon!