AITA for telling my friend she can’t bring her dog to my wedding?

I (28F) am getting married in a couple of months. I’m having a small ceremony and reception, with about 50 guests. My best friend (30F), let’s call her Sarah, is always with her dog. She even brings him to work, restaurants, everywhere. The dog is cute, but it’s honestly a little much sometimes.

A few weeks ago, she told me she’d be bringing her dog to my wedding because he’s like family. I was taken aback and told her that unfortunately, I don’t think it’s appropriate to have pets at the venue since it’s a formal event. She got really upset and said I was being unreasonable and that she wouldn’t attend if she couldn’t bring him. I told her I understand but it’s my big day and I don’t want to deal with the stress of managing a dog at the venue.

Now she’s telling everyone that I’m being cruel to her and how I don’t care about her bond with her dog. AITA for saying no pets, or am I being a bad friend?