Skip to Content

3 Month Old Rottweiler: Weight, Size, Food, Training & More

Rottweilers are excellent dogs breeds that need to be properly socialized and trained from puppyhood.

To avoid health issues, a rottweiler owner also needs to know their typical growth pattern. This article will discuss rottweiler puppies’ normal growth, food, behavior and some related information you may find helpful.

3 month old rottweiler Size: How big is a 3 month/12 week old rottweiler?

3 month old rottweiler puppies will grow about 18 inches in general. Both male and female Rottweilers are almost the same size at this stage of their life. After a few months, male rottweilers become taller than female ones. Slightly overgrowth or undergrowth should not be a matter of concern.

Congratulations on your diction to get a rottweiler puppy. Rottweilers are giant dog breeds and are categorized as working dogs. They are hard-working, intelligent dog breeds, and they need a tough owner like them.

A rottweiler puppy will grow rapidly in the first stage of life like any other dog breed. A 3 month old rottweiler puppy will grow about 18 inches. From the 2nd month to the third month, they will grow at least 5 inches.

After that, rottweiler puppies’ growth rate will slightly decrease. From the 3rd month to the 4th month, a rottweiler puppy will grow about 2 inches. They are not the tallest dog, but they are known for their muscular body and strength.

What if your puppy is 16 or 17 inches after three months? There is nothing to worry about. The growth also depends on their genetics and environmental factors. Just make sure they are eating enough quality food.

3 month old rottweiler Weight: How much should a 3 month old rottweiler weigh?

Three month old male rottweiler puppy should weigh 34 lbs to 39 lbs. A female should weigh 30 lbs to 35 lbs after three months. This is more than double the weight of the second month. They need proper sleep and light exercise to get used to rapid growth.

After the second month, a male Rottweiler puppy will be 12-16 lbs. But in the third month, the puppy will become 34-39 lbs if they meet proper growth requirements. Male puppies are heavier than female ones.

In the third month, rottweiler owners should be careful about the puppies’ activities. Make sure the puppy does not have too much exercise. If the puppy jumps around too much, it can cause joint and bone problems.

Joint and bone issues can happen at this stage because they suddenly grow big and heavy within a short time. But their bone lacks the strength to bear that much weight suddenly. After a couple of months, their bones will get stronger.

But the good thing is they are less likely to have joint and bone issues like other tall and giant dog breeds. The average lifespan of a rottweiler is about 11 years. It’s also higher than many giant dog breeds.

3 month old rottweiler weight:

3 month old rottweilerWeight should be
3 month old rottweiler male34-39 lbs
3 month old rottweiler female30-35 lbs
3 month old german shepherd rottweiler mix male32-36 lbs
3 month old german shepherd rottweiler mix female28-34 lbs

3 month old rottweiler Food

What to feed a 3 month old rottweiler?

Commercial large breed puppy food is considered the safest food for three month old rottweiler puppies. Large breed dogs have different types of nutrient requirements than other dog breeds.

Rottweiler and other giant dog breeds become pretty heavy, so their bones need to be stronger. That’s why their food needs certain nutrients that will help bone development from puppyhood.

No matter which brand you choose, the food needs to be giant dog breed puppy food, and it must contain calcium and phosphorus. Those nutrients are essential for bone development.

How much should a 3 month old rottweiler eat?

A three month old rottweiler should eat 2-3 cups of giant dog breed puppy food. Divide the food into three parts and serve the food three times a day. Feed your puppy at the same place and same times of the day.

However, like humans, dogs may have slightly more or less appetite on a specific day. Sometimes they can act like they are eating after a week, and sometimes they may not seem that interested.

That’s not a big issue if they are not doing that regularly.  You can feed them slightly more or less, depending on their appetite. But never fee feed your rottweiler puppy. They are prone to obesity and related disease.

A fat puppy is more likely to develop serious health issues like bone disease, heart disease and even cancer later on.

You can also consult your vet and make a feeding chart for your rottweiler puppy. He can suggest the best available food and feeding schedules.

After the puppy gets four months old, two servings a day is enough for them. As they are giant dog breeds, their digestive system is bigger and longer. So they can eat more food but needs more time to digest.

3 month old rottweiler Behavior: Barking, Biting, and Aggressiveness

The third month is a crucial period for a rottweiler puppy. They can be distractive and wild if you stay lazy and don’t train your puppy correctly. Imagine having an adult rottweiler who thinks he is the alpha! Scary, isn’t it?

So it’s essential to train Rottweiler puppies from the second and third months of their birth. You also must have an idea about the common behaviors of rottweiler puppies of different ages. Here are the general behaviors of 3 month old rottweilers.


Rattwilers dogs do not bark without any reason. They would be calm and patient dogs if you raised them well.

A 3 month old rottweiler puppy will not bark much. They even start to bark at suspicious strangers after they grow fully, around the second year. So, there is nothing to worry about if you notice your puppy is quiet.


All puppies bite. It’s a natural behavior of their development. Provide them toys they can spend their biting energy on. They can playfully bite you. Puppy bites are weak, but don’t let the habit stay. Make a crying sound if the puppy bites you.


Rottweiler puppies are cute and playful. But soon, they will become giant, powerful dogs. And you must make sure you make habits of obeying you from childhood. Or else it will be very tough to control him later.

They can develop aggressive behavior for some major reasons. Read this part carefully.

Firstly, they like to stay around their owner. If you keep him alone most of the day, he can become depressed and aggressive.

They are intelligent, but if they do not get mental stimulants and stay in a boring life, they can act weird.

They are very active, and they want a job to do. If you cant play with your rottweiler and spend time with him. Rottweilers are not for you. They also need proper socialization.

But with love, time and adequate training, rottweilers can become one of the most balanced dog breeds.

How much sleep does a 3 month old rottweiler need?

A three month old healthy rottweiler puppy will sleep about 14-15 hours a day. As we previously mentioned, they grow rapidly at this stage of their life. For proper growth, they need sound sleep and nutritious food. As they grow older, their sleep time starts to reduce.

How much exercise for a 3 month old rottweiler?

Rottweiler puppies need 10-15 minutes of light exercise twice a day. Walking is the best exercise for rottweiler puppies. 15 min walks are enough for them. Add 5 minutes of extra exercise sessions every month.

Too much activity can be harmful to rottweiler puppies as it can cause joint and bone displacement.

What does a 3 month old rottweiler look like?

Only within three months the rottweiler puppies will become more than 60% of their adult size. They will look like big puppies that didn’t get used to their height and weight. An average rottweiler puppy of 3 months will grow about 18 inches in size.

How to train a 3 month old rottweiler?

Training a rottweiler is moderately easy and just started from puppyhood. Rottweilers are intelligent, obedient and patient. Here is some essential training you should start giving your three month old rottweiler.

Potty train:

Potty training is relatively easy but takes some time and patience. Take your puppy outside, where you want him to take care of his business every 2 hours. Once the puppy does it right, treat and praise him. Repeat this until the puppy does it alone.


Socializing is undeniably vital for rottweiler puppies. Most Rottweilers are friendly and obedient to their family, but they will create tough situations in front of harmless stranger dogs and people without proper socializing.

Take your puppy to the park, and let him play with other people and dogs from his puppyhood.

General commands:

Teach your puppy general commands like come, follow, sit, wait, stop barking, clam down etc. Those are essential to control and communicate with your dog.

Final Thoughts

18 inches and 34-39 lbs are the estimated size and weight of a three month old rottweiler. At the same time, 18 inches and 30-35 lbs are estimated sizes and weights of the same age female. The puppies need proper food, training and socialization to do well later in their life.