trick to spotting a catch dog prospect

I don't think anyone can look at a bulldog or pup and tell if it's going to catch or not. Several years back a guy from town brought me one that was weird as any dog I have ever been around. And I was sure he was not going to catch This dog was bug eyed and had no personality at all he didn't wag his tail or hassle or try to play or anything a normal dog does he would just stand there.. I was kind of scared of the dog to be honest cause I couldn't tell what kind of mood he was in so I give him to a guy that we hunt together some and he turned out to be a fine catch dog he would of been a terrible pet but he was good at his job I've never heard him bark or whine or even act like a dog he was straight ear everytime and had jaws to go with it . He was easy to staple up as he would just stand there doing nothing like he was in a zone or something. But when I looked at that dog that day I thought this is just another waste but I was wrong and have been wrong on some I thought was going to catch. Just try to find you some and try them out and get one with a temperament you like .