To prevent your boxer from pulling on the leash during walks, you can try the following techniques:

1. **Training**: Teach your boxer the 'heel' command. Start in a quiet environment and reward them for walking beside you without pulling.

2. **Use a Front-Clip Harness**: Consider using a front-clip harness that discourages pulling. When your boxer pulls, the harness will redirect them back towards you.

3. **Positive Reinforcement**: Reward your boxer for walking nicely on the leash. Treats, praise, or a favorite toy can be great motivators.

4. **Change Direction**: If your boxer starts pulling, abruptly change direction. This will get their attention and encourage them to focus on you.

5. **Stay Consistent**: Consistency is key in training. Practice regularly and be patient with your boxer's progress.

Remember, each dog is different, so it may take time to find the method that works best for your boxer.

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Topics covered in this question:

Boxer Dogs Dog Behavior Leash Training Walking Tips