[Roos_Girl]

I think mine do it to annoy me, along with the low grade whining.

[Paladin2]

"along with the low grade whining."

My dog hates red lights on the way to the river.

[Salamander]

Borderline subsonic or ultrasonic whining?

Mine do both.

I can hear it *just* enough to start twitching.

;D