Ritual Defilement from Animals That Walk on Paws

You must consider, among all the animals that walk on four legs, any animal that walks on its paws to be ritually defiled, meaning that anyone who touches their carcass will be ritually defiled until he immerses himself in a mikveh and then waits until evening. This includes dogs, bears, and cats.

Anyone who carries their carcass must immerse his garments in a mikveh, besides becoming ritually defiled himself until he immerses himself in a mikveh and then waits until evening. You must consider them ritually defiled in this respect, as well.