Also, as with any new medications or supplements you give your dog, keep an eye on them after the first administration in case of an allergic reaction. After administration, melatonin starts to work within about 15 minutes and lasts about 8 hours.
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Your dog may experience drowsiness or an upset stomach after ingesting melatonin. Watch out for other changes, too, including allergic reactions like vomiting, diarrhea or general itchiness. Contact your veterinarian if your dog starts showing any of these signs.
Dog owners that supplement with melatonin report normal hair growth, normal energy levels, and normal appetite and urination in their dogs. Veterinarians recommend giving dogs over 30lbs 5mg melatonin (1 tablet) every 12 hours. For smaller dogs visit our Amazon storefront for other dosages and flavors.
Melatonin seems to have a calming effect on dogs, like it does on humans. In a study of healthy dogs getting ready for a surgery, those that were given melatonin before the procedure were more calm and required less initial anesthesia.