Gets along with children: No Audio has never shown aggression towards young kids, but their eager/excited energy & tendency to put hands in his face a little too abruptly, definitely spikes his anxiety and could potentially lead to aggressive outbursts one day (if a canine-savvy individual isn't around to notice the obvious red flags his body language would alert of).
Gets along with other dogs: Yes Audio is not your typical chihuahua and serves as a stellar ambassador for the breed. He gets along well with dogs, cats, and humans alike. However, he has no concept of his small stature and will establish himself as the alpha whether he's amongst a herd of 75lbs+ canines, or pups & smaller breeds his own [actual] size.
Gets along with cats: Yes Audio has lived with many kitty roommates over the years. He does like to engage them in playful games of chase/hide and seek, but will respectfully back off if the kitty gives him any indication that they're not interested/ wish to be left alone.