It may look like a water spot. The spot may be rounded or have a wavy shape and not really enclosing any area. If the fingers are run over the spot, it will be noticed that the pile runs in one direction until the edge of the spot is reached. The edge of the area will appear rough, or raised, and then once outside the area, the pile runs in a different direction from that in the spot. Shedding Dogs and carpets shed.
Carpet however stops shedding, or fluffing sooner than dogs.
Fibers will surface which have been left in the carpet during manufacturing. This is not a defect, but a normal occurrence which is corrected by regular vacuuming. Snags Tufts that have pulled out of the carpet should be clipped off with a sharp scissors. Never pull them. Snags occur most frequently in loop pile constructions.