
This sounds like all Malinois I know -they sing with excitement. :) Mine do it until let off the lead, they just can't wait. They also do it when we first set off in the car, when we prepare their food -you name it. I had to laugh just over a week ago when we were in N. Ireland and heard my friend's Mali doing exactly the same. Pretty much everyone I have spoken to in the breed say their dogs are the same, so seems to be a breed thing for us. One way of stopping it is to simply stop when they start doing it, preferably make the dog do a stay as well. Not moving. Nothing exciting will happen at all unless they're quiet. Takes quite a bit of patience though, so personally I just put up with it.