Can I have a dog??

Grandma Jan's dog, Sophie, had puppies in December. I was hoping there would not be enough for us to have one, but there is. She's cute, but we don't have a good track record with dogs-if you pee on the floor, you're done. Grandma has offered to try to train her, so Carsen can have a dog. Buddy has seen 2 other dogs come and go, even though he is a pain in the neck, he doesn't pee on the floor. I really hope this one works out. She won't be here until March, for Carsen's birthday.