Fleas multiply fast and do not voluntarily leave the body of the pet, the flea allergy will last for a long time.

There are symptoms that will tell the pet owner that the dog or cat is being troubled by a flea allergy. Some symptoms displayed by dogs are slightly different to those found in cats. But in general, the symptoms of a flea allergy are continuous itching, loss of hair, occurrence of sores, and unexplained depression.

Among dogs, the specific symptoms are: