Chester had his annual booster on Saturday. Ever since he has had some pretty regular loose stools and, once or twice, `proper' liquid diarrhoea. Before I go overly worrying myself I want to know if this can be a noted side-effect of vaccinations, or (as I think more likely) if he is just adjusting to some new dog food? I am assuming it is the latter, but I just wanted to check with those more knowledgeable than I. If it continues for longer than today I will take him back to the vet.