Things to not say out loud while in public when staring at a service dog

My husband and I are real people, please think before you speak...
  1. "Does that guy have a disability or problem?"
  2. "Is that a dog?"
  3. (Pointing) "He has a dog in [insert place]!"
  4. "I think those dogs are trained. I bet I could do that."
  5. "I have a dog just like that."