What are the symptoms of dog allergies?

Common ones are: 1. Chronic allergic reactions: localised scratching, red rash, skin loss, redness and swelling of the ears, vomiting, diarrhoea etc. 2, skin allergies: dogs itchy places usually in the nose, stomach, toes, etc., will keep scratching their bodies, may see red spots on the belly 3, drug allergies: will appear shortness of breath and easily feel agitated, emotional instability. 4、Seafood allergy: Some dogs are allergic to seafood, causing allergic dermatitis, red skin and rashes. 5、Protein allergy: redness and swelling of the limbs, generalized scratching, red rash, or in more serious cases, shortness of breath or even death by shock, immediate medical attention should be sought.