Adult Weight Giant Breed Examples - 100 or more lbs Name of Dog: Date of Birth: Breed: Weeks 1 4 8 12 16 18 22 26 18 mos Adult Weight (1-2 years) Date Weight Giant Breed Average Weight 3-4 lbs 7-9 lbs 20-26 lbs 31-40 lbs 45-59 lbs 50-65 lbs 57-74 lbs 70-91 lbs 91-118 lbs Bernese Mountain Dog Newfoundland Great Dane Saint Bernard Mastiff 80-110 lbs 100-150 lbs 100-200 lbs 120-200 lbs 175-200 lbs https://dogs.lovetoknow.com/wiki/Puppy_Weight_Chart