If it's a first date type of thing, then sorry bucko, thanks for the conversation and have a good life.
If it's something that cropped up after things were already well-established, that would be really, really hard. I've been plenty happy being single before. I've been prepared to spend my life as a spinster, with plenty of dogs.
I'm a miserable mess if I don't have a dog. Going to college was really hard on me in that respect, to the point that I went and made friends with the local pet store just so I could go in and cuddle their puppies to get that fix.
So basically...I can live without a guy. Not so much without a dog. This is part of the reason why I am *terrified* to have kids--I don't really want them in the first place and if I did go through with it and then find out they were super allergic, I'm really not sure what I would do.