Originally posted by Banzai Seppuku:

Do 2 star boars breed 2 star piggys? Do 2 star wolves breed 2 star?
I've seen people talk about getting a 2 star and breeding but.... wtf. I begin to doubt them. Found a 1 star and 2 star boar. Woot. So I tamed them. They were by one of the boar rune stones. Ok so then getting them back.
This little piggy did not want to leave that stone. The 1 star went into the boat fine. The 2 star... not so much. Once it was X far away from the stone it went nuts trying to get back. Since its tame you can harpoon it. It wins in a pushing contest.
Ok piggy challenge accepted. 2 game days later... I built a corral and slowly moved it towards my boat by wedging myself between it and the fence... it was constantly pushing to get back. Dropping new fences in. I finally drop it in my boat and .. what! it weighs enough that when it gets on the edge of the boat it can jump off.... and back to the stone. Once it stopped at the stone you could push it like a normal critter till it tried to move again. Got it in the boat again and same thing. So I decided to build the pen there. I can teleport so no biggy piggy. Just about done and a skelton comes and kills it.
Now when I had the 1 star in the boat and the 2 star at the edge of the ramp into the boat fighting it I got pinned while they made a piggy... not sure how the mechanics of that worked but the piggy just grew up and it appears to be no star.
1 Star boar was fine with the boat when It wasn't moving. 10 seconds after starting back it ...somethinged and poof dead and gone.

Only way I see is harpoon on the same landmass. Or remote pig farm.