Common Allergies in Pets Irritated eyes, itchy skin and constant sneezing may be signs that your dog or cat has an allergy. 이 세 가지 유형의 알레르기는 반려동물에게 특히 흔합니다. Flea Allergy Dermatitis If your pet is allergic to the saliva of fleas, just one bite may cause intense itching.