I've seen poisoned mice make it to the middle of a garage floor before dying...where a pet could eat it or chew on it...I wouldn't risk it..
In my friends old auto shop,he's had a severe mouse infestation ever since he rented up almost 15 years ago...we'd often see mice race along the wall on a dangling extention cord,or find them living in his co-workers huge Cornwell tool box/chest..
One day he went to get some sandpaper out of the cabinet on the side of the toolbox he rarely opens,and found a sleeve of masking tape,still in the shrink wrap,filled to the top with mice nests !--one day not long before that,his co-worker filled a bread bag with acorns he removed from a car's air filter housing,about a pound of them,that rodents stashed away in it--and they dissapeared,the next day the bag was empty..
We found them all stacked neatly in the sleeve of masking tape under the nest material..and we were baffled as to how the hell the mice managed to get them IN there,when the box had NO openings or holes larger than 1/4" !--we could see the mice squeezing through a tight spot,but the acorns ?..
..
He had to leave "escape sticks" in all the buckets he put under leaky spots in the roof,and waste baskets too,or else find dead mice rotting in the bottom of them after they went in to get the soda from discarded cans or crumbs..
One day about 2 years ago,as my friend was eating lunch at his desk in the office,he saw a white "thing" race by him as it came in the front door--at first he thought it was a cat,but it flew under a couch and hid under it..he got his flashlight and found what appeared to be a ferret or weasel (or erskine maybe?),looking back at him...
It had little fear of humans,so he assumed it was someones pet at one time perhaps..soon he had it eating food he put on the floor for it,and if he wasn't careful,it would swipe his lunch and run off with his food!..
That thing must have liked eating mice,because it hung around a good month,and we saw fewer and fewer mice as time went on...
One day not long after that,the neighbor next door came by,to tell him he heard a "murderous scream" behind his mobile home next door to his shop,and when he went out to investigate,he saw a "Fisher Cat" run off into the woods after snarling at him!..it had killed 2 cats,one was his,and we never saw the ferret again ,or a racoon that also came by looking for a handout sometimes..(later on he found it run over in the street in front of the shop)..
..
He still has a mouse in the shop once in a while,but since they replaced the roof,the rotting back wall that had holes big enough to crawl through,and tightened the place up a lot,there hasn't been too many mice,and he thinks most of the "new" mice are actually living in cars he works on that were sitting at auctions and car lots a long time,and they jump ship in his nice warm shop and move in..
...but I really wouldn't want to hurt one of our Dogs or cats if they got into it. Same as poisoning, not going to do it. Unless in a closed vehicle that no one goes into for months at a time.
. The last time I went to check the traps I saw this big ass f*cker just waddling away casually. I'm using the BIG snap traps, the ones that are 6"x3" btw.
Got two on Saturday night and another last night. These are big ass rats, these bastards are soo big they somehow manage to flip out of the traps and I find them dead next to the trap. 
