Stray Cat In My Garage

Hello fellow cat lovers. I am coming to you for some advice.Over the last month I have had a stray cat hanging out around my house. I keep finding her on my front/ back porches and in my garage. I am not sure who she belongs to .She has no collar but looks healthy and well cared for.I have tried unsuccessfully to find her owner.My problem- she is pooping in my garage/flower beds/garden. My dog goes out to potty and if I don't see it first she eats the poo. ( I know gross right) I dont want my dog catching anything from Miss Kitty. Also my indoor cats are getting visibly agitated when she is around. I will be sitting inside and all of the sudden they start growling and I look outside and there she is. There is no food sorce drawing her in so that is not the issue. What can I do to try and keep her out of my yard/garage?

You can try putting a few clumps of your cat's litter around your yard - especially near where she enters.  It will tell her she is in another cat's territory.

Is there a way you could trap her and make sure she's fixed, though?  If she isn't and is outside, you may soon have more than one cat in your yard.  If she finds the accommodations suitable, she will make her nest and bring her kittens.  You do not have to feed her for there to be enough resources for her.