The answer to 'pest odor' is that common causes can include dead animals, rodent infestations, or even spilled food and garbage. Symptoms may include a strong, unpleasant smell throughout your home. The best solution depends on the source, but often involves removing the source, cleaning thoroughly, and using odor-eliminating products.
If the odor is from a dead animal, it's best to call a professional pest control company to properly locate and remove the remains. For rodent infestations or other pest-related odors, you may be able to address it yourself with traps, sealants, and cleaning, but a pest control expert can provide the most effective and long-lasting solution.