I hope my girlfriend's dog dies
Why do you want to hurt your girlfriend so much?
I hate that dog
That is horrible to wish ill on that dog. That is your girlfriend's dog and you should love it like you love her.
Her dog is always peeing on the carpet and doesn't deserve to be loved.
You may not like some of the things that your gf's dog does like peeing on the carpet, but that doesn't give you the right not to hope that it dies. You wouldn't want someone wishing that you were dead, so don't treat another living being in this way.