Can someone not be allergic to dogs and several months later be allergic to them?

Question:

I know someone that was around dogs fairly often and then a day ago said " I cannot be around dogs anymore im allergic to them now". I just thought that was weird. She is notorius for for over exaggerating and being over dramatic so I thought I would ask.

Answers:
I think people can be allergic to certain dogs and not others.

Yes, you can become allergic to something when you previously were not

yeah an allergy can develop anything during life

I'm not quite sure if that can happen with dogs, but it happened with my sister with cats. But this happened over two years without being inside a house with a cat living in it. She grew up having a cat, and then a couple years after the cat past away, we went to my aunt and uncles house who has a lot of cats, and we found out that she was allergic to them. (she is more allergic to dogs though) the doctor said it might be because she grew up being immuned to having a cat, that when she was "re" introduced to the cat, it made her have a reaction from being away from it for so long. but i'm not sure if that could happen with a dog over a short period of time like that..

yes it can happen. That actually is a reason why, over exposure to something. I wasn't allergic to latex until the age of 7.

Can someone not be allergic to dogs and several months later be allergic to them?

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