Absolutely it changes the situation. A registered gun, and a permit carrying owner means a law abiding citizen. An unregistered .357, stuffed into the waistband of baggy pants, by an unpermitted carrier seems a wee bit troublesome to me. Sorry, but I am like that.
No it does not, in terms of being shot for defending yourself from an attacking animal.
If he pulled the gun first and threatened the officers, fine.. set the dog on him and plug him.
If however the cops sent the dog on him and he defended his life by a registered or unregistered firearm is irrellevant. If they wanted to know if the gun was registered they could certainly find that out without killing him for daring to have the audacity to use a weapon to defend himself from an attacking animal.
Like I said, if the guy pulled the gun first, fine.. if the cops sicked a dog on him and then shot him for daring to have the temerity to allow his survival instincts do what they are supposed to do when being attacked by an animal, then that’s a big problem.