Likewise humans, dogs can develop allergies to substances from the environment. Even their allergic reactions are very similar to our immune system response in front of the perceived enemies of the body. Dog allergy mechanism is still unknown, the only evidence being that the mediator is not histamine, like in humans.
What are dogs allergic to? Many things, from pampas grass, to weeds, or birch trees pollen, to bee or wasp stings, to peanut butter, or even to the dog food.

Flea Allergy Is Easy To Diagnose

I think there’s no dog that hasn’t been infested with fleas at least once in his life. Fleas are everywhere, in the grass, in parks and playgrounds, and they can easily jump on a dog’s back, just like that. Then, they start to multiply very fast, and if the dog is allergic to fleas, the symptoms won’t delay: persistent scratching, running eyes, sneezing, partial fur shedding, or even skin rashes. If your dog has a light fur color, you can easily spot the fleas, because they make a lot of dirt, which remains hanging on the furs, in the shape of small, black spots. If the dog has a dark color, you won’t be able to notice the mess coming from the fleas living on your dog, but you can still apply an anti-flea treatment, then watch your dog for about two weeks, to see if symptoms disappear. If the dog gets well, then it is clear: he suffers from flea allergy, and you need to make efforts to keep him flea-free as much as you can.

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