And cats, and squirrels, and rabbits... basically everything small and furry. Though not too small. Mice and voles she's just very interested in (have caught her sniffing them but no more). Birds, only if one is right in front of her. Livestock, interested but not leaping about at the end of the lead barking.
I've looked prey drive up and get a lot of the same information. It's part of the hunting sequence, and some dogs go all the way, whereas others are bred to stop at earlier points in the sequence.
What I don't know is, does it mellow? Is it possible to reduce by training? Is there a chance she just wants to chase, and wouldn't hurt the animal beyond that? I guess there's no actual answer to those questions, but I'd love to hear others' experiences of prey drive so I'm a bit less clueless about the possibilities.
She's my first dog (hence the clueless), 17 months, has some kind of sighthound in her, but I was led to believe it was only 25% so wasn't expecting her prey drive to be quite so extreme. Shows no prey drive reaction to dogs, not even very small cat or fox looking ones, but I'm still very careful about where I let her off the lead just in case.