I just introduced two boars to each other tonight. Momo approached totoro making happy squeaking noises, but then stretched out and made these intense vibrating/rumbling noises and rubbed his body all over totoro. Totoro didn't really run but jumped around a little (couldn't tell if it was popcorning?) They rubbed noses and licked faces a bit. Totoro didn't make any noises, except for a few squeaking noises if momo accidentally stepped over his face. Momo didn't seem to mount really, in fact, he would try to dive under totoro. He would make the rumbling noises almost constantly while rubbing all over totoro. Totoro would run a little bit but not like he was scared, just seemed like he was like "whoa whoa I just met you, give me time!" Momo nipped a tiny bit I think at totoros feet, but totoro didn't run or make noise so I figured it wasn't in a harmful way. Any time totoro was trying to eat momo would dip his head under totoro's and rub. Totoro would shake his head a bit to kind of tell momo to stop, but never nipped. There was no teeth chattering or aggressive behavior that I could tell. They settled down and cuddled a bit. And if totoro was ever startled, he would immediately run to momo and try to cuddle up. I can't tell if one is being dominant? Momo is naturally very outgoing and totoro seems to be more skittish. Does it seem like they like each other?