A dog harness is an alternative to a collar for walking or controlling your dog, designed to provide more comfort and control, especially for dogs that pull on the leash. The Puppy & Co Dog Harness, large 2.5 cm x 45-70 cm, is suitable for medium to large dogs.  Harnesses are particularly useful for dogs that pull a lot, dogs with respiratory issues or dogs who may experience discomfort from wearing a collar.