I work for a hay and straw farm as well as living on a small horse farm.
I carry a gerber multi tool (600)daily along with a medium/large folder of some sorts, lately a framelock that I made but in the past it was a benchmade pinnacle and others as well.
The multi tool gets used all the time. I really can't imagine how folks go without them. It has saved me hundreds of miles of walking back to the barn or truck to get tools. The baler we use ties the bales with wire, which is getting to be a rarity theses days, so I use the wire cutters a lot for that. A 100lb roll of wire only ties between 4 and 5 hundred bales, and thats only one side, you have to have 2 rolls in the baler and it will hold 4. We might put up 1000-1500 bales of straw or hay in a day so you usually have to add 2 more rolls(one for each side) sometime during the day. The pliars and wire cutters are a must for splicing on another roll. Once in awhile the roll messes up, or the baler misses tying a bale and then you need the pliars and wire cutters to pull the messed up wire out of the knot tyer, and then rethread the good wire.
Then there are always cans to open, wire to strip, saddles or bridles that need chicago screws tightened. Sometimes I use the can opener as a hoofpick (to dig rocks and dirt out of a horses hoof, so it doesn't get bruised), breaking ice off of water buckets or door latches in the winter, the list goes on and on.
I use the knife for cutting open bales of hay tied with twine, feedbags, packages of other stuff etc. We have automatic waterers in the stalls and pastures, and lots of drain pipes and field tiles that need fixed from time to time, so its not unusual to have to cut plastic pipes. Once in awhile I'll need to adjust a peice of tack at the last minute at a horseshow or out away from the barn where I don't have a hole punch, and I use the knife to make a new hole. I try to save the old hardware off of halters and things that break so I have to cut that loose (like cutting a double layer of seatbelt)
Knock on wood, I haven't had too, but I have friends that have had to cut horses loose from things, IE. accident with trailer, halter is hung up on things and it can't get free etc.
Well, I could probably go on, but I think its pretty obvious why I always have a knife on hand now
