I'll book the resort I want, regardless of it being dog-friendly or not.
That said, there's no way I'd bring my (very spoiled) pooch with me on vacation. I can't imagine being cooped up in an unfamiliar hotel room all day would be very much fun for him. Also, I'm on vacation so I don't want to have to worry about getting back to the room to make sure he's walked, fed, etc. My dog stays with a fabulous dog sitter when I travel so I know he's being well cared for and having fun while I'm away. It's a win for us both!