
My dog had diarrhoea 2 weeks ago and was very lethargic as well. She was unwell for about 3 days. The first day she was just lethargic and I put it down to the heat but the next day she was squitting all day, thank goodness the door was permanently open

I starved her that night and the next day. By the 3rd day's evening I just gave her boiled rice and then the next day rice with some of her normal JWB. She was fine by then.
I think when dogs have upset stomachs you should starve them for 24 hours and ensure they drink plenty of water so that they don't dehyrdrate. If they are no better by then I would visit the vet.