To determine the correct collar size for your boxer, you will need to measure your dog's neck. Boxers typically have neck sizes ranging from 14 to 20 inches, depending on their age, size, and whether they are male or female. Here’s how to measure:

1. **Get a Measuring Tape**: Use a flexible measuring tape or a piece of string that you can measure later with a ruler.
2. **Measure the Neck**: Wrap the tape around the thickest part of your boxer's neck, which is usually just above the shoulders. Make sure it's snug but not too tight.
3. **Add Extra Room**: Add about 2 inches to the measurement to ensure comfort. This will allow for some flexibility and growth, especially if your boxer is still a puppy.
4. **Select the Collar**: Based on your measurement, choose a collar that fits within that range. Collars typically come in small (up to 14 inches), medium (14-20 inches), and large (20 inches and up).

For example, if your boxer's neck measures 18 inches, a medium collar that adjusts from 16 to 20 inches would be a good fit. Remember to check the collar regularly for proper fit and comfort, as boxers can grow and change in size relatively quickly.

Additionally, consider the type of collar that suits your boxer's needs, such as a flat collar, martingale collar, or a harness for walks. Each has its benefits depending on your training and walking style.

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Topics covered in this question:

Pet Accessories Boxer Dog Care Collar Size