I think so that he needs more mental stimulation. I had started playing find it with his food for 35 minutes, but didn't do it over the weekend and today.
I agree here. Many of your posts indicate Sisko is a high energy handful. It's normal for any dog to want to play, and it sounds like your cats are also playful. Unfortunately, dogs and cats have different play styles. One of my friends once observed cats wag their tails when they are mad and sound like they are growling when they are happy: no wonder dogs have trouble figuring cats out.I think being confined to the apartment because of pandemic, and the fact that Sisko doesn’t get to run free and let off steam is part of the problem. Small quarters and multiple animals and people, combined with lack of activity is not a good combination.
Hopefully life will get easier soon and things go back to normal.