In ,
PawsForThought composed with style:

Asthma and granulomas can indicate a weak
immune system, and there are things a person can do with the help
of a vet to strengthen it.

I could be totally wrong here but I believe allergies are more the
result of an over active immune system. I think this is why steroids
help a lot of the time because it suppresses the immune system.
Something about too many white blood cells attacking what the body
considers foreign, right or wrong.

It can also be the result of over
vaccination.

That is my understanding, too.