Need Help... Need tips about a bay dog..

It is good to socialize a pup at home. But it is a form of training. If you call the pup to you and it hangs around then the pup will like to be around you and sometimes we are the cause. I believe that if the dog does have a strong desire to hunt then this won't matter much but a pup that is borderline might want to hang out.
I socialize my pups and call them to me so they can learn the command but the majority of the time I like them to roam and explore. This is pre-conditioning them to hopefully hunt and to not worry about the pup wanting to just hang out with me.

I would drag the pig and stake it out and leave the pup at home or have it in another truck.

Make sure it has been a while since the pup ate and make sure it is not tired. I make sure the pup is fresh and wanting to do something... If in the hot summer train early in the morning or late in the evening.

Use everything you can think of that will help the pup trail and bay.
Drop the pup in the area where he can pick up the scent and give the command to get ahead. Ignore the pup and go find a place to sit for a while. Usually the pup will get bored and will go out and find something to do. This might just make him go find the pig and bay.

If he does not go to the pig go get another dog that will go and bay and the pup should go with the dog or to the bay.