Dog Urine
Dogs may occasionally spray or urinate on lawns and this will scorch the turf surface causing it to go a brownish-yellow colour. If you notice this taking place then give the area a light surface forking and wash through with water; once a lawn has been scorched then carry out the same activity but it the scorching might have killed off the grass plant, in which case reseeding or returfing will need to be carried out.