It's been my understand that dogs can hear higher frequencies than us, but what about lower ones? How about the bandwidth of our voice?

 

When I'm training my dog, I use alot of body language with verbal commands and she's right on target with me. But when I stop moving and just give verbal commands she doesn't seem to pick up unless I say the word just right.

 

Was wondering, to what capacity do dogs hear our words? How do they interpret this apparent "charlie brown" gibberish?

there is a chart here:

http://www.school-for-champions.com/senses/hearpitch.htm

 

based on this chart i think dogs can hear lower frequencies than we can

They also hear much higher.