Its Douglas i am at my wits end with him , he is obsessed with eating anything he shouldnt the worst is cat poo and if he ever gets the chance dirty nappies

I can deal with him being mad for just normal food but the cat litter thing (especially now im pregnant ) is making me physically sick all the time.
Ive tried moving the litter but as hes got bigger there isnt anywhere he cant get it , i did have it under the stairs for a while but then the cats stoped using it as they wouldnt ask to go in , i now have it in the dinning room in a corner which suits the cats i even bought one with a lid and a flap but Douglas still gets in

Obviously i try to keep it as clean as i can but sometimes its just not possible and he notices before us

He will not "leave" and "no" makes no difference whatso ever when it comes to the litter , ive tried having him on a house line which is fine when hes on but as soon as he gets off his nose is too the floor and hes off !!
Where am i going wrong ??
As anybody got any suggestions , i know this sound stupid but its starting to mean i dont want him near me as the thought of him just makes me

I tried having the litter and the cats upstairs and the dogs down but the cats started jumping into my little ens cot so had to fetch them back down.