@Justin1364 Saying dogs outside only is unenforceable, as are most rules in entire place listings with off-site hosts. When guests break rules, you either have to suck it up or confront them, so the less rules necessary, the easier your hosting will be.
Just because most of the listings near you are pet friendly doesn't mean you have to try to compete with that. There are guests who are allergic to dogs, so it could actually be a selling point that you could mention prominently- that it is a pet-free property.
I've had dogs pretty much all my life, and they have all been outside dogs, but that didn't mean they didn't wander in and out of the house sometimes. They just spent most of their time outdoors and slept outside. My most recent dog much preferred being outside to inside, but liked to sleep on the cool tile living room floor under the ceiling fan during the day in hot summer weather and was terrified of thunderstorms, so always wanted to stay in my room near me at night in a storm, even though though I have a covered outdoor terrace.
And while I like dogs, I never accepted pets in my listing. My dogs never were allowed on the furniture or bed, but I knew that was unenforceable where guests are concerned, even though I have a home share listing. If the dog is used to sleeping in bed or lying on the sofa, they will do it at your place, too, regardless of any rules to the contrary. As a dog owner yourself, I'm sure you get this- they aren't like children to whom you can say, " I know we allow you to do that at home, but you can't do it here"- a dog can't understand that distinction, and pet owners who allow their dogs on the furniture at home won't change their ways.