Well over the last few days, he's been sick twice and his poo is quite soft, though not completely runny. It smells quite eggy though.

On Monday he seemed lots better and was livelier and eating well, then today he's not eaten as enthusiastically and is a little quiet.

His ears don't feel particularly warm and he seems happy enough - just not 100%.

Any tips on what to do or feed him (he usually has Hi-Life & Orijen)?

Is it worth taking him to the vet or should I give him a day or two to see if he gets better?

We've all had colds - not sure if he could have picked something up off us?