
Hi Sharon
We had exactly the same with our dog after crufts last year, we had stayed the night in the crown plaza hotel, showed our dog on the Thursday, Friday evening when we had got home he was being voilently sick and had really bad diarrohea, later that night a friend from weymouth rang us to ask if our boy was ok (she didnt even know he was ill) we asked her why she asked this as no he was really poorly, she told us to get him to the vet immediately as her young dog was on a drip with the same symptoms they thought they were gona loose him.
Thankfully both dogs were fine a few days later, both too had raging temperatures.
My friend seemed to think it was duck poo around the lake that had caused it as we both walked the dogs round there.
Hope your dogs are fine soon