It's weird, I actually feel like I'm more of a cat person but my fursona is a Catahoula leopard dog.
They were my first actual "fursona" (quotes because when I made them I didn't even know about furries or fursonas) but the reason they were a dog to begin with was because I just drew everyone as dogs (it was during my dog craze phase). They were a Great Dane to begin with because shortly before I made them, I saw a litter of Great Dane puppies and I ended up loving Great Danes. I changed them to a Catahoula Leopard dog though in, I think 2016, because I liked the newer markings/colours better (they used to just be greyish-blue with a white underbelly, no white anywhere else except a small marking above the nose). Also, they never really looked much like a Great Dane anyway, so yeah.