The active ingredient in that poison is bromethalin. Most rodent poisons require multiple feedings to kill, but as the name implies, that stuff can kill after one feeding though it still may take a few days for the rodent to die. I don't know if chipmunks will eat that or not, but if they do it should be very effective.
Whether or not that stuff will harm your dogs or cats depends on the weight of the animal and how much they ingest. It doesn't take a lot of that stuff compared to some other poisons and cats are supposed to more sensitive to it than dogs. If you use it, keep it where non-target animals and kids can't get to it.
From what I read, it is unlikely but possible for cats, dogs, or other animals to get secondary poisoned. That means the might have problems if they eat the dead rodents. Since rats can eat more than mice, the worst case is when several rats die above ground where the animal can find them and eat enough of them to get a bad dosage.
California has banned the sale of products containing bromethalin directly to consumers, but licensed exterminators can still get it. I don’t know where else it may be banned. California’s concern wasn’t just pets and kids but that some wild animals were getting poisoned, such as owls, bobcats, and at least in one case a mountain lion.
I don’t recall seeing that stuff on the shelf here either. I don’t know if it is banned here or they just don’t stock it.
