I have been treating my lawn with a fungicide for a possible fungus problem. Also I noticed some well define 3-4 inch diameter dead brown spots mostly in the backyard. There has always been rabbits and their babies in the backyard getting cover from a row of mature blue spruce. Also I have been seeing rabbits eating the grass. So how do I determine if the dead brown spots are caused by fungus or rabbit urine? I have included: 1) A picture of a dead area with rabbit droppings in the left side of dead spot, along the spruce trees, 2) a picture of several dead spots near each other near the house, 3) A close-up of a dead spot. If the dead spots are caused by rabbit urine, how do I address?