An E-collar or cone may be needed after your dog has surgery or if he has a wound. It can prevent your dog from licking their wound or scratching a wound on their head. Your dog should wear the E-collar following the directions provided by your veterinarian. You may need to make a few adjustments in your home to ensure your dog does not get stuck in confined spaces. Also, you may need to adjust his feeding station to assist with eating. It is not recommended to let your dog outdoors unsupervised while wearing the cone. If your dog will not tolerate the E-collar, discuss other options with your veterinarian.