Ahahaha xD Tripper just spent like ten minutes convincing me I had a ball. He started doing his 'I want to play with that ball you have' routine, which mostly involves backing up, laying down and cocking his ears. He usually does this after dropping a ball on my lap, but I didn't think I had a ball. I saw he was looking at the table I was using my mouse on, so I showed my mouse to him, but he shoved it out of the way. Finally I got up and saw...the ball I thought he had lost under the couch! Somebody must have found it and put it on the table. It was at the back of the table, behind my mouse. As soon as I said "Ohhh! I see it" he jumped up and wagged his tail xD Of course we went outside to play ball to make up for my denseness, lol.

But it did remind me of the one other noise he makes - he does sometimes whine and bark when he wants something you have, but usually only balls, and only if you're teasing him. I think this time he did it right away to get my attention, because he knew I didn't know I had the ball. But with him it is mostly body language, which I think I know pretty well.