I agree with you with there being souls in the Puppet (Just look at it) and Phonty (What else can explain a Phonograph being alive). But, I think Doggos is some kind of robot because it's music has some robotic sounds to it.
Could be possible that Doggos is an animatronic programmed by someone to kill everything that’s moving and that’s not a staff member (he was probably programmed by Viktor.) But maybe there’s also a soul trapped in Doggos?
