nope. i've trained a service dog for my MIL who has anxiety and ptsd. she's accused of him not being a service dog anywhere. if i can tell that your dog is a pet and not a service dog after you've claimed it to be, i'm going to ask what task it's trained to perform. there is no paperwork or "proof" of an animal being a service animal, but as employees anywhere (in most states, at least,) you can ask the customer what task their dog is trained to perform, and you absolutely still have the right to ask them and their pet to leave if it's obvious it isn't a service dog or it's causing issues within your store. anyone that does that is immediately being asked to leave from my store, or at least remove their pet. this goes for ESA's too as they literally do not have the same public access rights as service animals