update: after approximately 3 1/2h bonding in my washroom, Keiko and Milo could not be happier. They clicked instantly. Milo never rumbled back at Keiko or anything, they shared food (thanks to little Milo, Keiko was curious enough to try lettuce! hoping he develops a taste for it!) They chased, popcorned, no sign of aggression or bullying, and now in their new cage are eating from the same food/hay bowl even though they have their own. Milo is even eating from Keiko's bowls (which i didn't use vinegar to wash, so may still smell like him) and there are no issues! Happy chirping, no rumbling since the first 5 minutes of exploring the new set up, and I couldn't be happier. Milo's foster mom even threw in his favourite chew toy and his lovely little fleece bed at no cost, because she wanted to make sure he was happy
After a week or so i plan to give Keiko his edible house (whats left of it anyways lol) and Milo his bed back. They seem to have no issues over territory! They shared chew toys that smelled like the other, Keiko even shared his one baby carrot with Milo which I NEVER expected to happen, since he treats those carrots like the best thing in the world! And Keiko is still my affectionate little boy
he jumped onto my lap during the bonding and that convinced Milo to come give me a sniff even though this is his first day with me! I just know my close bond with Keiko will make taming Milo that much easier. Special thanks to
@Wiebke for all your incredibly helpful threads on boars and introductions! I can see the change in Keiko already, he's 10x happier with another piggy to keep him company! pics to come soon, once Milo learns not to hide when I approach their cage