Noah,
I've hunted with a guy who called off his catch dog to make him release. He was the type of guy that spent tons of time with his dog and was really big on verbal commands such as sit, heel, stay, and so on......
Here is what makes me nervous.......A group of guys hyped up on adrenaline trying to leg a big nasty boar and the dog hearing something he thinks is the release command.......not a situation I want to even consider personally.
When my dog is caught I praise it while I'm sticking the hog (when I can) and then as the hog is dying (really praising the dog).....I then use the break stick to get the dog off and continue praising the dog all the time. If the dog re-catches before I can get him tied then oh well......I praise him some more.......
The dog is caught and knows he is doing good because I'm laying the praise on thick......
Just the way I fix my tea......not for everyone