AITA for Refusing to Babysit Because of My Sister's New Dog?

In this AITA story, a woman has been babysitting her nephew for two years but recently found herself in an uncomfortable situation when her sister adopted a dog, despite knowing about her allergies and unease around dogs. When asked to watch both the dog and her nephew, she stood her ground, citing her health and safety concerns. Her sister accused her of not caring for her nephew, and now they’re in a major argument. Was she wrong for refusing to babysit under these circumstances? Let us know your thoughts in the comments! 🐕💔