First, explain to your mother the positive influence of puppies on you. Pets are often not just children's pets, but family members and companions. So you can say to your mother, "You want a puppy. With a puppy, your life will be richer and help you get rid of loneliness. When mom and dad are busy at work and have no time to accompany you, it will be more interesting to have one more puppy in life. You can take the dog outdoors and play together. It can help you quit some bad behaviors such as playing games and being obsessed with TV dramas, cultivate your good habits of loving exercise and sports, and improve your mental state and physical and mental development. "
Second, explain to mom that puppies can help you improve your ability. Every parent hopes that their children can develop in all aspects, not only in learning, but also in practical ability. So you can tell your mother that having a puppy can help you exercise your hands-on ability. Because after you decide to get a dog, you should start to make nutritious food for the dog, and at the same time, you should bathe the dog and so on. In this process, it can help to improve your hands-on ability, so that your ability in all aspects can be significantly improved. You will also become more independent and know how to take care of yourself, so that you can take care of your daily life even if your parents are not around, which is very useful for improving your independent living ability.
Third, exchange excellent academic performance for puppies to stimulate children's enthusiasm for learning. Usually, parents are willing to give their children a gift as a reward when they get excellent grades in their studies or perform well in school. So you can tell your mother in advance that when your grades are among the best or you have made outstanding progress in your studies, I hope she can reward you with a puppy. With a puppy, you can relax yourself by walking the dog every day. The combination of work and rest can not only ensure the steady improvement of academic performance, but also get enough exercise to avoid sitting and doing homework for a long time, which is not good for cervical vertebrae.
To sum up, convince your mother to let her agree to keep a puppy at home. You should be sensible and emotional.
First of all, the positive influence of puppies on you can accompany you and avoid being too lonely.
Secondly, it is necessary to explain the improvement of puppy's ability, including the improvement of hands-on ability and independent living ability.
Finally, it should be explained that puppies are of great help to your study and life, which can help to activate your body and mind and achieve a combination of work and rest.
From the above three points, I believe mom will agree with you to have a puppy.