I have no personal experience but my dad is dealing with bob cats now. They have never been a problem before... until one of his great pyrenees decided that one of the neighbors was a bad guy and attacks the car every time it drives by. He rammed the car and my dad had to pay to get it fixed, now all the dogs are doing it. So my dad started shutting them up during the day and only letting them roam at night. Now the bob cats are coming up in the day and taking chickens off the yard. My dad is having to catch and pen his free range flocks now because they've only been going after the ones that roam loose. They haven't touched any of the penned chickens so far. I've got some babies right now from him. One of his free ranging hens hatched them out and was raising them on the yard. She got taken right after lunch, broad daylight, but the babies were left behind. We didn't know what got her at first. Now we're finding tracks all over. Two bob cats either fighting or mating right behind our ground blind at the start of deer season scared off all the deer that day. So they will be out and about any time of the day, to avoid being seen they'll choose times they know you're normally not around. Around here bob cats love to eat deer. They normally go after babies and small ones, but deer aren't tiny things for long. They can take down prey that is bigger and outweighs them. I'm not too worried about them, because I've never heard of anyone being attacked by one around here. They normally run as soon as they see a person.