OMG you just brought back so many memories. They're mostly variations on 2 themes:
1) Our female cat Princess (going on 13) has her "invisible" boxes, usually shoe boxes. In this house though, when Princess thinks she's invisible, so did Schumy (other cat, 5, about the size of Tommy who looks huge!), Tequila (sharpei) and Jager (keeshond). Never failed - they would "look" for her when she went into her invisible boxes.
2) Schumy and the 2 dogs would play just like Dexter and Tommy do. Schumy would flip over on his back and grab at them just like Tommy does. I miss that!! SoCo seems to know he's at the bottom of the pack here and doesn't seem to want to take on the cats, I wish he would!
Brought the hubby to come see, those videos gave us both a smile and a laugh, thank you
Tara