Hi all,
This may be my first post on this forum -- perhaps because this is the first topic on which I might know (at least a little) what I'm talking about
I'm a small animal vet. The Chessie in question most likely has a food allergy. Food allergy in dogs causes the same skin issues as environmental allergies and/or flea allergy: red, irritated, inflamed skin (especially feet, ears, abdomen) that is susceptible to secondary infections. Mites and Ringworm (a fungus) can cause similar signs, so skin scrapes and fungal cultures are often performed on dogs with itchy skin.
To the extent we know what can cause food allergy, the primary culprits are protein sources and glutens. As you might imagine, formulating a gluten-free, novel protein diet for a dog can get both esoteric and expensive. Duck, fish, soy, venison -- even kangaroo -- are commonly-used novel proteins. $130 per bag sounds really pricey, but I must say that most such foods are $50 to $75 for a large bag. A Chessie will go through a lot of food...
And, of course, if you are going to pay for such food, it makes no sense unless you avoid the offending ingredients in treats as well. That means no Milk Bones, rawhides, pizza crusts... basically nothing unless your vet says it's OK.
So food allergies are a pain! But not uncommon. In fact, skin allergy is the most common reason we see dogs in our clinic. I could write a treatise on the subject of doggie dermatitis -- perhaps I just did -- but many have already been written. It is not a reason to pass on the Chessie, but it is something to be aware of.
Omega-3 fatty acids and antihistamines can sometimes help with dogs' skin issues, but for a food allergy the best thing is avoidance of the offending allergens. And that means a hypoallergenic diet.
Now, how certain are you that this dog does in fact have a food allergy? They can be tough to diagnose, since their symptoms are identical (in dogs) to allergies caused by environmental factors such as pollens, dust mites etc. Unless this dog went through a well-planned food trial, there's no way to tell for certain. Something to discuss with your local vet, perhaps.
Good luck with the dog!
Oh, and love this forum.
Charles L.