Something had too have happened to that dog at some point that boogered him up. Never heard of a catchdog that just stopped catching with a good reason like stated above, either broken teeth, internal injury, wrecked at some point etc etc. Hate to hear that it happened. If it were me and i really liked the dog i think i would let a good hunting dog friendly vet take a look and explain to them what is going on.

this is my buddies dog. For a long time he caught every pig we bayed solo, and was pretty good I thought, on track to make a nice catch dog. Then one evening his vest hung up on the way in to a big boar, that boar hit him and cut every muscle in his shoulder in half all the way to the bone. At a year and 3 months that dog got WRECKED! after that I bought a seasoned tried and true catchdog and they always caught together once he healed up. Or I just used the older dog. I sold that older dog a month or so ago like a Dumb arse and it didn't take long to realize my buddies dog just wasn't gonna make the cut. Couldn't tell you how many bays I've sent him too in the last month that he hasn't got hooked and I've gone home empty handed. He misses, and gets thrown, and he just ain't gonna stomp his guys into the dirt to hold a pig for me. Needless to say the catchdog I sold, I'm buying back here very very soon
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