They need a job to do and if they don't have something to keep them occupied they can get into a lot of trouble.
When we moved in here the neighbors across the street had border collies but the poor dogs had no job and the people left them outside most of the time. The dogs would come over to our farm and try to herd the horses. Our mares in particular took exception to this and would go after the dogs with a vengeance.
One time the wife complained to me that one of the dogs had a nip on it's back from the horses. I just laughed at her and told her that as a livestock owner it was within my rights to shoot the dogs harassing my animals. Our county had and still has a leash law - if an animal is not on your own property it is supposed to be leashed or under the owner's control.
I wouldn't have shot those dogs - they were well behaved around humans and just needed a job. But one of my show mares had a defect in her nostril from one of the dogs tearing the edge open. I had to get stitches but it still showed. If I could have proven it was their dogs that had done it, I would have sent the neighbors the vet bill.
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and awesome trainers.