...first time in the 2 weeks we've had him, our pup pooed in his crate. Runny, so obviously couldn't help it 
I hoped it was a one-off, result of foraging for something disgusting (sticks, leaves, fluff...he's a lab-x after all!) or maybe a reaction to finally having switched his food from Science Plan to Royal Canin - though I've been doing it slowly, yesterday was the first day of not mixing them.
Anyway, I fed him normally - and he seemed fine today, enjoyed walks, demanded his supper as usual. Then runny poo on his last stroll, and then a heap of diarrhoea on the floor this evening....what should I do?
Rice? Chicken/rice? Nothing? Vet in morning? He seems his normal self, if a bit more soppy/floppy tonight. Cool wet nose. Am more panicked for him than I am when kids are ill - I'm far more used to sick kids!