I've been using chunx bait for 3 years. In all that time I've only witnessed one chipmunk dead on the lawn. Threw it in trash on route to letting chickens out. Had multiple outdoor cats and in new location a dog. Never had a problem using chunx. Where I lived previously had a neighbor use (prior to my poison use) pellet poison which ended up killing another neighbors dog. Highly recommend chunx and tamper proof boxes. The beauty of block "chunx" is it's chewed off so nothing is strewn about for other non target animals to eat and the beauty of a tamper proof box is nothing can open it or get in unless the size of a rat or smaller. 99.999 (add infinity) percent of rodents killed have gone back to nests to feed young and all died there. Whether there is an out shed, barn or hole in the ground. Not in open where other animals would eat them. It's the best preventive system. If used there will never be a problem as very small populations die in nests after moving into localized area of chicken pen and storage shed. The one dead rodent (chipmunk) found was first year of use when over run with both chipmunks and rats. Rats under compost pile coming up from river and chipmunk holes over the entire yard. Disaster! Problem bearable in months time and completely fixed in two. Went through more poison being right on a river for general management thereafter and very little at new home. Here it is the start of 4th year and still have over a pound of chunks left from original 4lbs bucket. Use so little here, never dealt with population explosion, believe that it will last another two years. The next bucket will last even longer as I'll never be taking out hundreds from the start only slow management of area.
