
Hi Kay
It could be a mild reaction to the vaccine, but don't take any risks with a pup of 10 weeks - get back in touch with your vet, just to check. problem with very young pups is that diarrhoea can very quickly dehydrate them, so it's best to act quickly. If he's only had the one "episode" I wouldln't worry, but if he's going frequently get back to your vet ASAP