Would I be a bad person for not confronting my aunt about her use of a pronged collar on her dog?

Maybe a year ago my aunt got a puppy. She posted a photo of the puppy on Facebook and it had a pronged collar on. I was looking through her photos on Facebook and noticed a photo of her dog from a couple months ago and it still had a pronged collar on. I would confront her about it but im scared about how she might react. Would I be a bad person for saying nothing?