Tiny Pup to Massive Guard Dog? The Shocking Size of a Full-Grown Rottweiler

The first six months mark a period of rapid growth for Rottweilers. They typically gain between 2 and 3 pounds weekly, with noticeable increases in both height and weight.

Birth to 4 Weeks: Rottweiler puppies are tiny at birth, weighing approximately 1-2 pounds, and rely entirely on their mother's milk. By the end of their first month, they start growing quickly, gaining about a pound per week.

4-8 Weeks: By eight weeks old, Rottweiler puppies generally weigh 10 to 15 pounds.

8-12 Weeks: This is a phase of substantial growth. At 12 weeks, puppies typically weigh between 15 and 25 pounds.

3-6 Months: The growth spurt is at its peak. Male Rottweilers can reach 35 to 45 pounds, while females typically weigh 30 to 40 pounds.

Key takeaway: During their first six months, Rottweilers experience rapid gains in both weight and height, becoming increasingly active and curious.



During adolescence, a Rottweiler's growth rate moderates, but they continue to gain weight steadily. Between 6 and 12 months, they begin to resemble adult dogs more, though their physical and mental development is still ongoing.

6-9 Months: A male Rottweiler will likely weigh around 45 to 65 pounds, with females typically ranging from 40 to 55 pounds.

9-12 Months: As your Rottweiler approaches their first birthday, males will generally weigh between 60 and 85 pounds, and females between 50 and 70 pounds.

Key takeaway: While growth slows considerably compared to the earlier months, Rottweilers are still developing. They may appear somewhat awkward or "gangly" as their bodies adjust to their lengthening bones.



Between 12 and 18 months, Rottweilers approach their mature size. However, it's not uncommon for them to continue filling out until they are around two years old.

12-15 Months: At this stage, considered young adults, male Rottweilers usually weigh between 75 and 90 pounds, and females between 60 and 80 pounds.

15-18 Months: By 18 months, males typically reach the higher end of their weight spectrum, between 85 and 100 pounds, while females weigh approximately 75 to 90 pounds.

Key takeaway: Your Rottweiler is nearing their final dimensions. You'll notice a more muscular physique, and their coat will likely appear shinier and healthier.



Most Rottweilers reach their full size between 18 and 24 months. Some males might continue to add muscle mass until they are closer to three years old. Their height generally stabilizes, while their musculature becomes more defined as they mature.

Male Rottweilers: Adult males typically weigh between 95 and 135 pounds and stand 24 to 27 inches tall at the shoulder.

Female Rottweilers: Adult females usually weigh between 80 and 105 pounds and stand 22 to 25 inches tall at the shoulder.

Key takeaway: Your Rottweiler has achieved their full size, though their body may still be refining its musculature. You'll also observe them becoming more composed and stable in their temperament.

To give you a clearer understanding, here’s a quick reference chart showing the typical weight and height of a Rottweiler by age:



While the growth chart provides an average guideline, there are several factors that can influence the size of your Rottweiler:

• Genetics: Your Rottweiler’s genetic makeup plays a significant role in determining their size. If both parents are larger Rottweilers, it's likely that their offspring will be on the larger side as well.
• Diet and Nutrition: Proper nutrition during the growth stages is crucial. A high-quality puppy food rich in proteins and nutrients will help ensure your Rottweiler grows to its full potential.
• Exercise: Regular exercise helps build muscle and maintain a healthy weight, but it’s important not to over-exercise during the puppy stage to prevent joint issues.

Rottweilers are a majestic breed with a solid, muscular build. They go through rapid growth in the first 6 months and then experience more gradual increases in weight and height until they reach full maturity at around 18 to 24 months. Knowing the expected growth patterns can help you provide the right care, training, and nutrition to ensure your Rottweiler grows into a strong, healthy adult dog. Whether you’re a new Rottweiler owner or just curious about the breed, understanding their growth stages is essential for responsible pet ownership.

If you have any more questions or need tips on caring for your Rottweiler, feel free to reach out!

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Frequently Asked Questions (FAQs)

1. When do Rottweilers stop growing?Rottweilers typically stop growing in height around 18 months but may continue filling out until they’re about 2 to 3 years old.
2. How much should a 6-month-old Rottweiler weigh?At 6 months, male Rottweilers generally weigh between 35 to 45 pounds, while females weigh between 30 to 40 pounds
3. What is the average adult size of a Rottweiler?Adult male Rottweilers usually weigh between 95-135 pounds, and females typically weigh 80-105 pounds.
4. How fast do Rottweiler puppies grow?Rottweiler puppies grow rapidly, gaining around 2-3 pounds a week during the first 6 months of life.