Auggie LOVED both Kota and Happy but it was a different relationship with both.
Kota was Auggie's hero. He followed him everywhere, he would imitate him even. If Kota was out sniffing somewhere Auggie wanted to be there sniffing too. If Kota was out by the fence barking Auggie wanted to be out by the fence barking. He'd watch Kota and do what Kota was doing.
I still remember taking all three dogs to the dog park one time. Auggie was seven months old I think so he was still intact, and an intact puppy was apparently SUPER interesting to all the dogs at the dog park. They all were crowding him and Auggie was totally overwhelmed by like fifteen big dogs all poking at him and sniffing him, so we went off to a part of the park where there weren't many dogs around, and Kota came following with us (Happy was off sniffing somewhere by himself.) Well, one big dog came all the way across the park (it's a HUGE park) at Auggie - and Kota just casually placed himself in between the big dog and Auggie and basically body-blocked him from getting to little Auggie. My sister and I looked at each other like "Holy crap, did you just see that?" I've never seen a dog do that before but it was pretty unmistakable what Kota was doing. They had such a unique relationship. It wasn't really playmates though they DID play sometimes. The first time they played, my mom was back in the office and the dogs were out in the other room, and she started hearing scuffling, so she went out in the other room and found Kota chasing Auggie around. As soon as Kota saw her, he was like "Whoops!" and quit playing and tried to look like he hadn't been, LOL. He would play with him after that and it was no big deal, but they had lived together for MONTHS before finally playing.
Happy, OTOH, was the playmate... somebody to chase around, somebody to pester, somebody to pick on. I wouldn't say Auggie loves Kota more than Happy but they served different purposes to him. The first thing Auggie thinks of when he sees Kota isn't "PLAY," but that is the first thing he thinks when he sees Happy.
I think Kota liked Auggie plenty, but I think poor Happy didn't particularly care one way or another if Auggie was there or not... he'd play with him and have fun with him and all, but I don't think he especially enjoyed Auggie's company, LOL. As for Kota and Happy, I think Happy is really attached to Kota but I think Kota is kind of glad if Happy isn't around... but he is the grumpy old man who doesn't play much anymore, especially now. It was nice to have Happy and Auggie together, because mostly, they would play with each other and old man Ko didn't have to be bothered. They were a really funny little family unit when they were together and they did tend to move around in a little herd. I sure miss having all three together. =<
ETA: I should note... my mom put the Fetching tags we bought for Happy & Ko in a box and put them under the Christmas tree. She then discovered Auggie had taken that box out from under the tree and was laying down with it between his paws. He's NEVER pulled a gift out from under the tree before or even messed with them. It was so weird. I'm sure the tags smell like dogs since they came from Jen and she has dogs, but it was the most unusual thing in the world. It was like he knew where it was going and he was like "Here I'll deliver it!"
Juno is very friendly and just wants to play, but she can come off a little strong sometimes and a lot of dogs just say NO THANKS to that. 
