or just made it up completely by themselves? 
Arrow has!
When Arrow doesn't have a ball, he knows 'come' means to come, and sit by my side. However, when I say 'come' when he has the ball, he thinks I mean drop the ball!

I'm not 100% sure how it came about... I originally thought it was just a fluke for the first few times it happened, but I have paid attention to it and he does it EVERY time. I think he started it, because when I played with the ball with him, I would call him to come to me and try and teach him to drop the ball... But, I think he has associated the dropping of the ball with the word 'come'
I think this might be him showing me the BC cleverness... I have read so many times about how BCs can pick things up super fast (both good and bad) and they will work things out very quickly for themselves... without us even thinking about it... Oh well, at least I have a way to get him to drop the ball
I want to get a video of him doing it... people down the park think it is sooooo funny

Arrow has!
When Arrow doesn't have a ball, he knows 'come' means to come, and sit by my side. However, when I say 'come' when he has the ball, he thinks I mean drop the ball!
I'm not 100% sure how it came about... I originally thought it was just a fluke for the first few times it happened, but I have paid attention to it and he does it EVERY time. I think he started it, because when I played with the ball with him, I would call him to come to me and try and teach him to drop the ball... But, I think he has associated the dropping of the ball with the word 'come'
I think this might be him showing me the BC cleverness... I have read so many times about how BCs can pick things up super fast (both good and bad) and they will work things out very quickly for themselves... without us even thinking about it... Oh well, at least I have a way to get him to drop the ball
I want to get a video of him doing it... people down the park think it is sooooo funny