We have 3 male dogs They have all been together for years. Why do they occasionally turn on each other for no apparent reason?

Update: All 3 are fixed. The 2 that got into it are usually are in the kennel together. 1 is a rescue mutt, 8 years old, and the other, victim, a coon hound 7 years old. the 3rd gets put in a separate area because he jumps out of the kennel. the 2 involved apparently saw a raccoon in the yard on their way to the kennel... show more All 3 are fixed. The 2 that got into it are usually are in the kennel together. 1 is a rescue mutt, 8 years old, and the other, victim, a coon hound 7 years old. the 3rd gets put in a separate area because he jumps out of the kennel. the 2 involved apparently saw a raccoon in the yard on their way to the kennel while on leashes. Nothing has really changed in our home, we're in our 60's. Have had the dogs since they were all pups/born.
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