If you're a new Rottweiler owner, it's important to know that this is a large, slow-growing breed, and your Rottie won't be considered 'mature' or fully grown until he (or she) is at least 18 months to 2 years old. The final weight of these dogs is 85 to 120 pounds. The fastest growth stage is from birth to 8 months, the rest of the first year, growth will be a bit slower.
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