We have three dogs. Two are very short haired dogs and we have had them for years. A few months ago, we got another dog and he is long haired. Ever since we got him, my asthma has been so bad. I am getting headaches every day and my eyes burn, nose runs, etc. When he is in the same room with me, my eyes start to tear up and I get congested.

Is it possible to be allergic to just one dog? Is there a difference between allergies to long and short haired dogs?