Itching, scratching, or licking more than usual
Chewing paws or rubbing the face
Red, inflamed, or irritated skin
Recurrent ear infections or ear scratching
Hair loss or thinning coat
Frequent skin infections or hot spots
Watery eyes or runny nose
Sneezing or coughing
Vomiting or diarrhea after eating certain foods
Symptoms that get worse seasonally or after exposure to grass, dust, or pollen
Symptoms that improve when a suspected trigger is removed
A veterinarian confirming allergies through an exam or testing