Euthanasia is a medical procedure, and it can be scary for any animal. However, veterinarians are trained to make the process as peaceful and comfortable as possible for both the pet and the owner. The veterinarian will give your dog a sedative first, which will help to calm them down and make them sleepy. Once your dog is asleep, the veterinarian will give them a second injection that will stop their heart. This injection is painless and will cause your dog to pass away peacefully.