But allergies in dogs often look different than they do in humans, and their treatment varies as well. Instead of inhaling allergens, dogs usually pick them up through their skin, so they scratch and chew and roll and rub, making them prone to secondary ear and eye infections. The antihistamines that people often take for their allergies also don’t usually work in dogs, says Andrew Rosenberg, a vet at Riverdale Veterinary Dermatology in New Jersey. Steroids are quite effective, he says, but they’re not safe over the long-term because they suppress a dog's immune system. The best treatment is to get your pet tested and then give them personalized immune therapy, in the form of shots or drops, Rosenberg says.