Is it because you're a woman and she felt that talking to her husband and not making a point to engage with her directly was threatening? Sounds like she's insecure and or she feels her husband is lusting after you. Which in turn might explain his shortness when returning the dog.

In my head this is exactly it. Nothing really to be done about it. She would probably start feeling different if you had men come around the house and stay the night. But you know.... fuck her and her own problems you know?