Summer's been chewing some on her foot the past couple months. It's starting to get that reddish color on the fur. It's only on the inner two toes on her back left foot. I've looked all over the foot for signs of inflammation or anything and haven't seen anything at all. I have always read that it was allergy related? Is that true? Nikki used to do this all the time but for her it wasn't such a localized spot. She'd chew and lick her entire front paws. For Summer it is only that one little spot. My problem is that I can't think of what allergies it could be at all. I HAVE changed the dogs' kibble portion of their diet from mostly Blue Buffalo Wilderness and TOTW (all flavors of each) to Acana (all flavors). I *THINK* (but cannot be sure) that the foot chewing had started slightly before I switched the food over. I'm not 100% though. Is there any potential issue that is in Acana that is not in TOTW or Blue? I've had fantastic results with the Acana otherwise- lots of improvement in their coats especially and Mia is seeming to keep thinner a little easier too. Summer's had some upper respiratory allergies in the spring time historically and is on allergy medicine when she needs it. Thoughts?