Locate an remove dead rat

Rat traps were set in August 2017, now I have noticed a dead smell in the living room. I've looked around the gardens but didn't find the dead animal

Remove dead dog from under house
Dog has crawled under house and died Crawl space is too small to access...

Remove dead rat in roof
Bad smell coming from roof.

Have a dead pest in my roof that needs removing
There's a dead animal in the roof on the vent that needs removing

Animal has been removed and now assistance is needed to remove the odour.
Bad odour being removed from under the house after a dead animal was found.