They aren't all yellow but....
Champ, one or two barks if we were lucky.

Nitro, started out baying but then turned into a one or two bark if we were lucky....Garmin Collars helped him on more than one occasion.

Goober, as a young dog he had NO bark with age he has a little but still not enough for me to rest easy.

Forrest, he is 45 lbs of heart and is going to try it before he barks

Charlie, he is three legged and his age is catching up with his leg but as a pup he rarely bayed and even now he will try it on his own.
Needless to say our poor CD's rarely get any use!