Dog bites.

2nd time in 14 years in carpet cleaning business I was bitten by a small dog, when I was measuring, I guess the dog felt threatened by the measuring tape ( yes I’m a cave man still using measuring tape ).
The Customer was apologetic, asked me if I was okay, I said yes, I’m fine, didn’t tear any skin, just sting a bit since he also scratched me in the process.
I’m still a dog person and not going to be scared of dogs because of small incident like this, but I am considering banning of small dogs from my presence when I get in to customer’s homes, just how am I going to say it without offending them is still being cooked up in my head, especially those rich bastards with their poodle as their babies, no matter how nice you say it, one of them is bound to be offended and I hope it won’t happen in $ 2000 job, lol. Or maybe I should keep my mouth shut and just wear 2 jeans in those jobs huh ?

That's an easy one, tell them it is for the animal's safety. The hot tools and water can scald and the prespray will dry its skin if he comes into contact with it before it is extracted.

I have discovered that sunglasses and dark tinted eyeglasses are what sets many of them off. If they can't see your eyes, they do not trust you right from the start.

"ma'am, if you could secure the dog away from where I'm working..
Or
"I'm the stranger in the dogs house, ...

Could try the "I am allergic to animal fur"?

Lol, the sarcastic one will tell me I’m in the wrong business if I’m allergic to dog’s furs, but the other suggestions are pretty good, especially the safety issues, as if I really care about their damn chihuahuas, lol.