The phrase "mouse poison" refers to a substance that is used to kill or control mice. It is a type of poison made specifically for getting rid of mice from homes or other places where they are not wanted. Full definition
What makes JT Eaton Bait Block one of the best mouse poisons around? (geekwrapped.com)
Rodenticides — If you have rat or mouse poison around in your shed or garage, make sure that your dog doesn't have access to it. (sivet.com)
Rat or mouse poison interferes with blood clotting so you may see weakness from internal blood loss or visible blood in urine or stool. (edmondeastvet.com)