Skunks

Skunks are a common enemy of beekeepers, as they irritate the hives and can eat a lot of bees.

One common solution is to pop a small hole in a raw egg and to put an aspirin in, and bury it just under the surface near where the skunks travel. Aspirin is a blood thinner, and the skunks are small enough that it's fatal.

There are very few other animals that would fall prey to this, but if you have a small egg sucking dog, then you might not want to.