Sedation and anaesthesia allow your dog to relax, calm down, or go into a deep sleep so they won't feel any pain during surgeries or medical examinations where they may be stressed or nervous.
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As the solution is injected, the animal loses consciousness and within minutes the heart and lungs stop functioning. Since the pet is not conscious, they do not feel anything. Most times, the animal passes away so smoothly, that it is difficult to tell until the veterinarian listens for absence of a heartbeat.
Dogs recovering from anesthesia can take about 12 - 24 hours to return to their normal selves. You can expect some common side effects during this period, including sleepiness, whining, disinterest in food, and a wobbly gait.