Boxers typically stop growing in height around 12 to 18 months of age. However, they may continue to fill out and gain muscle mass until they are about 2 to 3 years old. It's important to note that growth can vary between individual dogs, so some boxers may reach their full size a bit earlier or later. To ensure your boxer is growing healthily, provide a balanced diet, regular exercise, and routine veterinary check-ups. This will help monitor their growth and adjust their nutrition as needed.

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Topics covered in this question:

Boxer Dogs Dog Care Puppy Development Health Growth