The frequency range of human hearing is roughly 20 Hz to 20 kHz, while the frequency range in which speech sounds occur is roughly 250 Hz to 6 kHz.
We know dogs hear in a much higher and broader range of frequencies than humans (one figure suggests from the high 60 Hz range into the 40 to 60 kHz range). In what frequency range can dogs produce vocal noises of communicative value?
(I understand that canine vocalization is not speech and consequently dogs don’t necessarily have the same discriminatory ability in the same frequency bands as humans. I promise this isn’t a question premised on some odd misconception of how speech and hearing work.)