Just like humans can get allergies, dogs can have them as well, which means that you should be aware of what dog allergies treatment would be the best if you ran across the situation. Just like you dont like being uncomfortable, your dog doesnt want to be in any kind of discomfort either.
So an allergy is really just an overreaction to an otherwise harmless substance. You know, like in humans when people are allergic to pollen or hay or other types of things in the air. They substances wont hurt you normally, but something about them irritates your immune system and causes some sort of uncomfortable internal reaction.
Many times if a dog has allergies, it will show itself as some sort of skin condition, like a rash for instance. There are also things like skin being red, itching a lot, losing little patches of hair, or they will get skin infections from scratching the area too much and it being in dirty conditions.
There are several kinds of allergies that effect dogs, and these include food allergies, bacteria, contact, flea allergies and ones called atopy allergies, which may be genetic in nature. These different kind of allergies manifest themselves differently, but the bottom line is that they are always uncomfortable and you should make sure you know which is the issue.
If it is a human that is allergic to the dog, they are probably allergic either to the dander that a dog has, or maybe the particular kind of hair that the dog has, especially if it is the long-haired variety. In addition, saliva and urine can also be a problem, as their chemical makeup causes trouble to.
The best way for a human to not have issues with dog allergies is to keep houses clean, especially bedding in sleeping areas. Being around things that you are allergic to while you are sleeping is a particularly bad idea, and you could see where it would make sense to keep the dog out of room that you might be sleeping in, for cats as well.
If it is the dog that has the allergies, the best way to deal with the skin condition is through several options, including changing the dogs diet, putting a cream of some sort on the effected area, or giving the dog some other kind of topical treatment it wont eat.
So whether the dog allergies treatment is because of a human being allergic to dogs or dogs being allergic to some other thing, there is always a way around the situation whether it be through something like a change in diet, a change in living situation, or some other solution to the problem.