I have 3 dogs (98lb, 21lb, 11lb) and 6 cats (8 to 16 lbs).
My 98-pound dog weaves between my legs like he’s a giant cat—sometimes taking me for a horseback ride because I’m so short! 
I just watched my 6-month-old cat carry a huge dog toy upstairs, hide it, and chew on it so it wouldn’t get stolen!
It’s amazing and a little weird to see the things they imitate from each other.