lad i know just built a run for his dog but no concrete base for the run he has put a load of wood chip down ontop of the lawn,the stuff you get from the garden center,he seems to think it will be ok just pick the shite up daily and renew it every few weeks although i think it is an expensive thing to keep replacing what you reckon will it be ok,im just thinking of the dogs feet surely it be damp throughout the winter although its got a decent enough kennel