DS1 (2.4) has teken to chasing our two Jack Russell terriers around the last couple of weeks. He pushes them off the sofa, pursues them under the dining room table and around the house, and keeps trying to grab hold of them. Occasionally he is downright violent, kicking and hitting. We have resorted to the naughty step when he won't stop, and a stcker chart for positive interactions with the dogs, but I don't understand what's behind it.
Sometimes he comes out with a completely unrelated reason as to why he has chased them, e.g.
Me/DH: J, stop it! Leave the dog alone!
J: But I want my milk/ But I've lost my monkey/ I want my train track out!
Any ideas gratefully received!