and the control of atopic dermatitis in dogs. do not use apoquel in dogs less than 12 months old or those with serious infections. apoquel may increase the chances of developing serious infections and may cause existing parasitic skin infestations or pre-existing cancers to worsen. new neoplasias were observed in clinical studies and post-approval. most common side effects are vomiting and diarrhea. feeling better? [dog] i'm speechless. [dog] thanks for the apoquel. that's what friends are for. ask your veterinarian for apoquel. next to you, apoquel is a dog's best friend.