Are you getting one of those for the dog or the coyotes? If coyotes,in my area,there's no laws against killing a coyote at any time. It is legal. They're such a nuisance! I live in the country country on a 24 acre farm. My husband and I have lots of experience with predators. I would recommend a 12 gauge shotgun (loaded with target load)if shooting at night. Which usually is the case. You don't really have the option of seeing through a scope and getting it right in the crosshairs. Also,they explode when fired. So it's kinda like little bb's spreading over a wider range. Better chance of making contact. If it's in the day time,which is very possible, a 22 rifle works well. They've got a scope. Mine has a red x that can be enabled for more accuracy. Point being,you can see a lot better to aim at either the head or behind the shoulder area. Making contact in the lungs or heart. They usually travel in a pack. A shotgun can be reloaded quickly! But,we've had a loner show up in the middle of the day! If it's for the dog.....we have what's known as "the castle law"here. Our land and everything on it is our castle. We have the right to defend it by any and all means necessary. So for us,a dog that's jeopardizing our animals or anything really,is no different. But that's our prerogative. I'll leave it at that. I wish you luck. Any time you lose a loved one,especially to a predator,is just devastating. God bless.
(I will say this,if the dog or animal ,causing harm,is your own.....that would definitely be a harder decision to make. I haven't been in that situation. We just bought a 7 month old German Shepard. He wants to eat all of our animals. We have to keep him separate,on a leash or in his pen. If he was able to kill one of my furr babies....I think it would just be instinct to take him down. But,as I said,I've never experienced it. So I can't say for sure. So sorry to those of you who are in this predicament. )