For this reason, most dogs and cats with severe flea allergies have never been found with fleas on them! (vin.com)
You may never actually see a flea or flea dirt on your pet and he / she may still have a very severe flea allergy causing the symptoms. (achlompoc.com)
He was riddled with fleas and suffered with severe flea allergy dermatitis. (luckydogcuisine.com)