What do you feed and what treats do you give?
My recommendation is dump the food and treats into the garbage and start over. Pedigree is one of the worst quality foods on the market. These coloring added to the food could be the cause of the hives. My pup came into contact with some cat food with coloring in it and swelled up to look like the elephant man. It was the most fighting thing I had ever seen. Look for a higher quality food with no coloring or dyes no by products same with the treats. I would stay away from the raw hide for the same reason some of the companies use toxic chemicals to tan the hide. Go to petco or petsmart stay out of the grocery store. Fromm or Taste of the wild are recommended here a lot. You could also go to Costco and get Natures Domain it is made by the company the makes Taste of the Wild but is a lot cheeper about 30 dollars for 30 pounds. As for the treats read the labels no coloring it looks like this Added FD&C Colors (Red 40, Blue 2, Yellow 6, Yellow 5). again no byproducts preservatives if not natural.Pedigree Large Dog, bacon-flavored treats, honey wheat dog biscuits, small rawhides