My 5 mo. old (had for 3 wk) doesn't come (which he wasn't trained) i got him from a show breeder and was pretty much handled for show up until then. He's great at grooming, bathing, crate training, yad da yad da

We think he now knows his name, DUDLEY, at least his perk up but he deosn't come when we call him, he'll stay doing what he's doing.

Well, I'm concerned when were outside (fenced yard) and time to go in, he thinks its a game or is scared. ( i can't figure it out) He hunkers down and backs up quickly, or simply goes in the opposite direction. When i walk towards him and bend down to pick him up, it like he's scared, very timid? He's fine once I'm holding him, just getting him...
I put a harness on him this morning, no lead, to let him run around in the house and get use to it, were going to try a lead this weekend, he doesn't like leads so we haven't gone anywhere unless i carry him like LOWES or HOME DEPOT, which he's good at.
Any advise on teaching COME, how do you do that????