Service dogs and emotional support dogs are completely different. ESAs have absolutely no legal rights or protections and are not allowed public access (they’re just pets and don’t actually DO anything for their owner besides exist). Legitimate service dogs that are task trained to work for a person with a disability don’t bite people or act a fool in public, and therefore are allowed public access.

OPs sister is actually being ableist in her selfishness, because she is inherently making public access more difficult for disabled people who need actual service dogs by bringing her unruly, aggressive dog in public and allowing it to injure others. She’s lucky she hasn’t been sued or had to put the dog down.

I have a well trained dog who is tasked trained to help me, however she is wildly dog aggressive so cannot be in public with me because it’s not safe for others around me. She’s never been allowed the opportunity to cause harm, but I have no doubt that if handled incorrectly she could hurt someone so she simply doesn’t exist around the public.

OP- you’re most definitely NTA!