How do you know you have a good catch dog?

I’m kind of like Cajun, good ones are harder to find now than they were 20-25 years ago. Around here, every corner has a dog for sale. Lots of people breeding dogs to sell, and make money with no purpose or thought put into it. I used to get all of mine from a friend that was the dog catcher for years. A lot of them worked out, some didn’t. Their future didn’t look too bright and if they worked it was a plus for everyone. If they make contact, it should be caught. When caught it should be on the ear. I have one now that will be 9 in February. He’s 53 lbs. in hunting shape. He’s not the prettiest, nor the most athletic one I have had. He doesn’t miss and he will not let go. I don’t mind breaking him off. When broke off, I don’t want to hear a sound out of him. I want him quiet at the house too. When I’m horseback he’ll be within 15-20 yards of my horse. He minds like he’s on a rope. Absolutely no dog or people aggression. When I figured out he was a good one, is when everyone says hey you bringing ol Hammer tomorrow aren’t you. I keep him legged up running beside me in the pasture that is full of cows. The new cows sometimes chase him, the others are used to it. If a pup is out there and barks at a cow, he’s under your feet. He knows somebody is getting a whooping and he doesn’t want it to be him. I let him go on a short chase if the hog breaks, but he comes back when I whistle. Every now and then might have to tone him. I have a nice young gyp I’m going to breed next opportunity.