so the other day this lady bought a German Shepard off me, she came, picked it up and paid me the…

so the other day this lady bought a German Shepard off me, she came, picked it up and paid me the money. I just got a message from her saying "can you take the dog back?" & I asked "why what happened with her?" and she went on to tell me that the dog was "too big"& the owner of her house won't let her keep it. & she said "I'm gonna have to go get my money" So I'm thinking she just told the owner she was getting a dog, the owner said it has to be small but once she found out it was a GS then she said no. I told her "you already bought her. I apologize but I can't give your money back, she's not something that's bought at the store & you can just return whenever you want"

I'm sorry but what the heck??? did you not know a GS is gonna get big? I'm so lost. my husband was like no we aren't taking the dog back she bought her & picked her out and everything. that's not our problem. what do you guys think? is that rude to not take the dog back? it's no longer our dog once we sold her.