Hi, I read your post on your baby boy. Could it possibly be leaking anal glands, a middle ear infection, crystals in his urine which will cause his urine to have a strong order. An infected glandular cysts? Check his body well for it
If it gets on his coat it can smell. Or could it be something simple like he is rolling in feces. Some dogs will do this with bird or other animals feces? Is there something in your home that is leaking? Or do you have cats with a litter box. Just trying to help. Kind regards, Victoria