Whoa that’s pretty cool! [spoil]In the film, Alpha’s voice is initially a squeaky voice since his collar is broken, but then Muntz fixes it. It definitely sounds like Bob Peterson.[/spoil]
Alpha’s real voice is the one that goes “Woof woof”
[spoil]I wonder (or rather I’m sure it is) if the use of the two difference voices for Alpha is commentary on how much of an effect the wrong voice in an animated movie can ruin it. He doesn’t seem at all threatening with his absurd voice (really reminds me of Kronk from Emperors new Groove) but his deep voice makes him so menacing.[/spoil]