I've known google to give questionable results when given non-specific keywords to search.
I once tried googleing for documented
hunting tactics used by wolf packs, by searching for such ambiguous terms as "wolf hunting tactics" and such. Big mistake. I wound up getting mostly
tactics used by humans for hunting wolves.

Oops.
Needless to say, I am more careful to be specific with my searches from now on.
I could hazard a guess, then, that ads like the one kibib pointed out (which I happen to be looking at right now at the top of the page as I type this, BTW) are what happens when google's ad generators are told to select advertisements for animal or 'furry' websites. Certainly worth a complaint, at any rate. Wouldn't want visitors to this forum thinking we support that in any way, now would we.