Finnegan's been scratching and nibbling rather profusely in his groin and lower underbelly area for the past week or so. It's gotten progressively worse. I've scoured the skin in that area and it's healthy, free of blemishes, redness or any other visual issues. Beauty isn't itching at all. He's fed Acana grainfree, I use mild detergent on his bedding, same stuff as I've always used. Nothing else has specifically changed in the household to cause this. The only thing I've thought of as a possibility are seasonal allergies of some sort. Should I try a few days of Benadryl to see if it makes a difference? Any thoughts?