<human>: Condense the text into a few key points

I have two dogs who are by and large good dogs but today they killed my neighbor's pet rabbit. Normally I'd just sort of chalk this up to dogs being dogs, but this is their 3rd kill in the last 9 months. (1 Raccoon, 1 Squirrel, 1 pet rabbit) and there may be one additional wild rabbit that they've taken down as well. 

The raccoon and the squirrel were in my yard, but the pet rabbit was in my neighbor's yard. The dogs broke through the 30 year old fence giving them passage into the neighbor's yard. It's unclear if the rabbit then wandered into my yard after the fence was breached and was taken down, or if the dogs did in the rabbit in the neighbor's yard and then brought it home.

My neighbor is a very nice woman and obviously upset, but from speaking to her she understands that this wasn't intentional or grossly negligent. I've taken steps to repair the fence and keep my dogs in. I'm more concerned about my dogs and other small dogs. Should I be worried about them trying to take down another dog? They get along OK with moderately sized (30# plus) dogs, but I haven't really had exposure to smaller dogs (my local park has a separate small dog area). 

Do dogs with an active prey drive typically distinguish between another dog that happens to be smaller, and prey which they hunt?
<bot>: dogs have thrice taken life of prey animals, potential bloodthirsty small dog killers, or just dogs being dogs?