One of the most commonly bought accessories for dogs is a dog harness, and most people rather have their dogs wear it 27/7. But this brings us to a very important question: Is it safe to leave a harness on a dog all the time? Safety-wise, yes, dog harnesses are simply the most secure, and most comfortable way to hook your dog to his leash. Harnesses increase your control, prevent constant tugging and/or pulling, and are perfect for dogs with neck and oesophagus injuries.  But just like dog collars, it’s best not to leave them on your dog all the time.