we have bought a lovely ddb bitch shes 14  months old and a joy to own,the only problem we have is shes always sick at night.nearly every night anytime after about 8.30 she brings her tea up.we feed her twice a day breakfast about 9 and tea around 5.30,shes never sick after breakfast or trough the day, she has arden grange with just a tiny bit of butchers tripe.she doesnt rush her food or exersice just before or after eating.has anyone got any suggestions as to why this keeps happening.