Instructions
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1
Begin with the breed of dog in question. Various breeds grow at different rates. Smaller sized dogs mature a little quicker, reaching 99 percent of adult weight between 9 and 10 months of age. The larger breeds don't reach that stage of adult weight until 11 to 15 months of age.
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2
Determine the age of the dog and its rate of growth to calculate the ideal adult weight. A small dog gains about 5 ounces per week from 6 weeks of age, whereas a large breed gains about 2.5 lbs. As a result, it is estimated that a small dog would gain approximately 1 1/4 lbs. per month, while a larger dog would gain about 6 1/4 lbs. per month.
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3
Double the weight of a 6-week-old tiny or toy breed of dog, and then double it again, and you will get an estimate of what the adult dog will weigh. If your tiny dog weighed 2 lbs. at 6 weeks old, the weight calculation would be 2 x 2 x 2 for an estimated ideal weight of 8 lbs.
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4
Take the weight of a larger breed of dog at the age of 14 weeks and multiply that weight by 2, and then add another half of the 14-week-old weight to estimate the ideal adult weight. For example, if your larger dog weighs 20 lbs. at 14 weeks old, the calculation would be 20 x 2 +10 for an estimated ideal adult weight of 50 lbs.
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