Thank you everyone for the responses.
The reason my dad said he doesn't want another dog, is he doesn't want to take care of another one. He says that he'll be too old by then to take care of any other pets. He's not even in his 50s yet and he's already been talking about this stuff.
The only dog he said he'll approve of us getting, is a LGD once we move. Only because I brought that up to him and mentioned how I'd be the only one training, taking care of, etc.
I'm actually not sure how I brought that up to him when I did.
I also found a few breeders who will possibly have some litters near November of this year and February of next year. I don't mind waiting, I just want to bring it up to him in a way to convince him.
Especially since it'll most likely be MY dog and I plan to make sure I take care of everything.