I still cannot access the Arthur Puppy Playtime scene, I have the collar, I have tried speaking to him both in his room and in the lab, no results. Can anyone else at least confirm they have done it?
You need to have the Akra main quest done to get access to the Pulse for your crew members. If they can't access the second floor (unlocked after the battle) they can't go to the Pulse, which is supposed to be part of the scene. I had the same issue and that's what solved it for me. After that you'll have the "puppy play time" option in the same color as the tests. It'll tell you what other items you need.