I walked into a room at Book End the other day. My mum sat at one end of a sofa, and the dog Alfie, the old wise head of the pack, was lying across all the rest of it. My mum looked up and said, "There's plenty of room on the sofa, if Alfie moves up." Alfie obligingly got up and sat down next to my mum so there was room for me.
I am not claiming, of course, that Alfie understands English syntax. But I believe he knows enough keywords to have a fair understanding of most everyday conversations.