Ohhhhhhhhhhh I don't know.
I hate the idea of these people who get animals to turn them into breeding machines and more often than not, that is what these sites end up getting used for. Gumtree is terrible for it.
And if you want a kitty or dog there are SO many looking for homes in rescue centres already. However, from personal experience, some make it very difficult to get through the process and people who genuinely want a pet need to get one from somewhere....
Not sure I'd use it though.
xxx