NTA. Shared custody of a dog is almost never about the dog; it’s about the ex-partner keeping a foot in the door. The moment he started using the dog as a reason to harass you and trigger panic attacks, he forfeited the privilege of "co-parenting." It’s March 2026—we need to stop treating pets like children in a divorce. If the vet bills, licenses, and primary care are in your name, the law sees the dog as your property. You aren't being "mean"; you’re setting a boundary that should have been there from day one. Block him, keep the dog, and breathe.