OP, you sound so much like me!
I was determined to get another dog in the near future and then last week I started thinking twice about it.
DH brought home a tub of stuffed animals from his mom's house. One of them was a very large teddy bear. Chloe has always loved her babies, but let's just say she was loving this teddy bear a little bit too much.
I think she felt threatened by it because of its size.
Every time she's around it, she starts um, dominating it. I'm a little concerned now that she'll react this way if another dog is brought into the house. It's something I'll definitely have to work on, if I decide to.
Why don't you look into fostering instead? The organizations usually take care of all the expenses while you have the dog, and there so desperately needed.