Many dogs do well for ultrasounds without sedation. However, anxious dogs may benefit from sedation to make the process easier on them and the veterinary team. Some scans, such as a full abdominal scan, can be lengthy, and sedation may help keep the dog still and calm. If the veterinarian collects a biopsy sample of an organ with ultrasound guidance, sedation is recommended to reduce the risk of injury and pain to the pet.