I didn't have my headphones handy, and I just randomly played the 22 kHz >> 8 kHZ test on my MBP's built in speakers and all of a sudden my dogs just started going nuts when the announcer gets to around 14 kHz. Oops!
I guess my ears are strange, I couldn't hear 22 kHz >> 19 kHz (tried on headphones and speakers) but could hear 18 kHz >> 9 kHz. If under 14 sounded anything to your dogs like it did to me I feel sorry for them, I felt like barking.
