with the dog poo we always put it in our compost along with the chicken poo ect.
Not really recommended to put dog poo in the compost if you use commercial worming treatments as they will kill off the good worms in the compost. (someone can correct me if I am wrong)

i know of so many woman who just fluss their used tampoons down the loo, now wondering how many of the your FIL see's Salad
DH used to camera the sewers and now deals with treatment plants. The worst things for blockages that he had seen are tampons and nappies. Yes some people flush the whole nappy. Also the problem is greater these days due to less water from water conservation methods going down the system. The sewers need a minimum flow to keep everything moving.