You can think of allergy as an overactive immune system. 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.
Dogs don't get asthma or hay fever. Dogs manifest [allergies] by having itchy, inflamed skin. While this itch can pop up anywhere, it's most common around the face, feet, belly, and sides.
[
Collection
]
[
|
...
]