Buy it.
Go to Home Depot or Lowe's and purchase a box of mouse poison bait. Get the ones that are green blocks about the size of your thumb. Then remove the bottom drawers and drop these poison bait blocks behind the drawer where your pets cannot get to them. Also place them around the water heater and fuse boxes. These places are usually protected so pets would not be able to get to the poison.
The poison in these bait blocks are basically blood thinner. After the mice eat the bait and start bleeding internally they become thirsty and most often will go outside in search of water to die.
If you do not like the above solution, get a number of bang-them-on-the-head mousetraps and baited with peanut butter. Then you can strategically place the bang-them-on-the-head where you see droppings.
