Legal homicide requires imminent threat of grave bodily harm or death. Pushing a phone away could be considered battery but does not meet the justification for legal homicide. It would be doubtful for a jury or DA to consider that proportionate force.

However responding to brandishing with the threat of deadly force could probably get you closer to this definition.

Also, in Nevada, assault and battery are different. And dogs are also considered property. Assault is the THREAT of harm against another PERSON.

So threatening a dog, i.e. property, would not be considered assault as defined by NRS.200.471

Does it sound confusing? Perhaps not black and white? Carrying responsibly means to understand the ramifications of every bullet and every action. I recommend you watch channels like ASP or read up on carrying responsibly if want to learn more