Hello,my dog has just come back from kennels but has diarreah.he has now had it for 3 days but seems fine,how long shouldf i leave it before contacting vets.I Have starved him for 24 hours and fed him rice and chicken

As it has not settled down with the treatment you have given I would take him know.  My kennels insurance covers me for several days after going home so you could contact yours and find out if you are similarly covered.