Rats, you have rats and one died in the walls, so what happens then. In general, it will take around three to five weeks for a rat to completely decompose. The biggest issue when it comes to decomposing rats is the fact that they can smell extremely badly, and that smell can actually last for more than five weeks once the body has decomposed. There are five stages of decomposition; initial decay, putrefaction, black putrefaction, butyric fermentation and finally dry decay. Each stage gives off it’s own distinctive odor. Shortly after death, the bacteria in the intestine begin to digest the intestine itself, then the surrounding internal organs. The body’s own digestive enzymes spread through the body, contributing to its decomposition.
Dead Rat?
https://www.linkedin.com/pulse/dead-rat-randy-bilesky/?published=t