It is also not advisable to leave the collar on your dog at all times or leave it on them when you are away. Also, prolonged use may cause skin problems for your dog. This is why it is best to remove it once in a while. Checking for any signs of irritation on the neck area before and after use will help prevent further skin problems. However, if you found redness or swelling on the neck part, refrain from using the device and wait until it has fully recovered. Bringing your dog to a veterinarian will help hasten the healing as the dog may take some medication such as antibiotics.