What is the proper usage of allergy?
To start, I make some examples the way I know it and please help me verify. Thank you.
Right now: I am having an dog allergy. I am having an dog allergy attack.
Describing who I am: I have a dog allergy. I am allergic to dog. Dog is an allergy to me. (The last one sounds weird. This shouldn't be a common usage. )
Describe what it is: Dog causes allergy.
Wrong usage: Dog is allergic to me. Dog is allergic.