Hi, I am wondering if it is considered "poisoning" to purposely purchase a dog and bring it into a household, knowing that your roommate is allergic to dog dander with intent to make your roommate move out? Is that legal?

Long Story Short:
While I was away for the Holidays, I learned that my roommate, knowing that I was allergic to Dog dander, purchased a 2nd dog without asking me.
In my opinion she is purposely poisoning me, trying to get me to move out of the house so that way she does not have to. (To read the full living situation, please see below.)
Is that considered poisoning and is that legal?

Here’s the situation: A couple months ago my friend and her dog were being evicted from their apartment, because the landlord made a rule that “no dogs” were allowed on the property. Of course, I felt bad for her. I allowed “my friend” and her dog to move into the house I was renting. We found a 3rd new roommate. The 3 of us signed a brand new lease together. I have been living in the house since June and they moved in November.
Within the very first week I realized that I was allergic to my friends dog, and told her the unfortunate news. I told her that our living situation was most likely not going to work out, because I was having severe allergies to her dog and that in the meantime we needed to try to find a solution to make it work. My roommate’s exact response was “If I have to move out then I am going to be a really angry bitch.” Repeating herself over and over that she would turn into a very “angry bitch”.
For the past 2 months I have been unable to live in my house because of my horrible allergic reactions to the dog.

While I was away for the Holidays, I learned (through Facebook) that my roommate, knowing that I was allergic to dogs, purchased a 2nd puppy without asking me. Now she has 2 dogs in the house that I am allergic to.

In my opinion - by buying another dog, she is intentionally poisoning me, trying to get me to move out of the house so that way she does not have to.
Is that legal?

Note: The house I am currently renting is prime real estate, right on the beach. It’s nearly impossible to find such a great rental property, never mind one that allows dogs.
Side Note: Although the 3 of us signed a new lease together, the roommate with the dog still has not paid her portion of the deposit that I paid in full to the landlord.