I start them out very young riding on a 4 wheeler. I train mine in the woods. I only run one to two dogs at a time. After the youngster has been on a few I try to let it run solo and work things out on it's own as much as possible. I like my dogs to be independent and not have to rely on another dog to find & stop hogs for them.
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After a couple of times, I want my pups baying by theirself. I have no use for a dog that needs company to bay.