He's two and had gastroenteritis type bug. We're onto day three. Spewed once, lots of diarrhoea. Temp now gone. He's hardly eaten a thing but he seems quite weak today. Not sure what to do as we've been enduring we get fluids into him with a syringe but obv can't force feed food. I know it's normal for them to liar thier appetite... But for how long?