Like humans, dogs can be allergic to pollens, dust mites, and mold spores, which typically shouldn’t pose a threat to the body. “You can think of allergy as an overactive immune system,” says Douglas DeBoer, a veterinarian and professor of dermatology at the University of Wisconsin-Madison School of Veterinary Medicine. “Your immune system normally is supposed to be protecting you from foreign things like bacteria and viruses. In some cases, your immune system becomes overactive and it starts responding to things in the environment that it shouldn’t be responding to.” He adds that allergies often develop in a dog’s first three years of life.
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