Upon closer examination, I discovered that dogcows actually "speak." In a very excited condition, like being near an open can of Mountain Dew, dogcows will say "Boo Woo! Moof!" But it is much more common to hear them just say, "Moof!"
Source: wiktionary
“And won’t you just cry out and beg for mercy? You know, Alisha dear,” warm breath on him, “I used to think he was just a dog, and then I thought he was a cow, but I think—I know—he’s just a cross between both, a cow and a dog. Cows go moo, dogs go woof, so what does a dogcow go? Moof moof moof. Go moof, Chuck, go moof.”
Source: wiktionary
Everyone knew where the hackers were sitting when they started yelling “Moof! moof!” at the screen—“moof” is the sound the LaserWriter Options dogcow makes.
Source: wiktionary
His name, they say, is Clarus. His bark, they say, is Moof.
Source: wiktionary
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