My family used to have a shitzu and it was the most miserable thing ever, bit and growled, etc. 

Since said dog passed away, I was given a cat for my birthday and graduation. He is four years old, used to having the reign of the house, and doesn’t do well with other animals from what I have seen. He also hides from my nephew whenever he is over and refrains from eating or going to the litterbox when the nephew is over. But obviously this is only temporary. 

Now that we are suddenly getting a dog, and a bigger dog at that, I am worried about how my cat will do with a new animal. I am nervous that he will have to hide 24/7 and will not be able to be as comfortable as he has been in his life thus far. I feel as though this is unfair to our current animal and that my parents are too optimistic that everything is going to work out, ignoring the possibility that the cat could get hurt or risking having to separate the two of them indefinitely if anything goes wrong. Sure, they could end up buddies, but I’m still terrified that something might happen and that my parents sprung a new animal on the cat without even thinking of the possibility. 

So, am I the asshole for being upset in this situation and wanting to protect my fur baby? 