Sorry i know its a bit late but "cut"grass is really bad,so avoid it at all costs if your dog likes eating grass.Last year we were supposed to have pony rides at our kids summer fete,but because the council had just cut the grass the owners of the ponies wouldnt even get them out of the horse box,as for some reason cut grass can really upset there stomache and would imagine its the same for dogs.I think it is because the grass starts to rot once its cut.