There are probably a range of reasons why your mum doesn't want a dog. Do you know, they cost thousands of pounds a year to care for. E.g: food, insurance, vet check-ups, kennels.
Are you going to pay for it? Have you a job? Or would it be left to your mum to try and find the money. I suspect, this may be one of the reasons she may not want a dog.
Also, at 15, if it's your pet, you should be able to at least partially pay your way for it. If you can't, then don't get one.
Also, having a dog is like having another child about the place. They need care and attention, like a baby. If not, that's when they become dangerous. Do you have time, when your education, age 15, is very critical, to care for one?
So, it's not just a case of having a cute thing to adore now and again. Having a dog is like a full time job, which is why most dog owners have time on there hands, and lots of it, so to care for it properly.
I know you wanted to know how to persuade your mum, but if your mum simply can not afford it and does not have the time for it, there is no way she can change her mind. What goes on under her roof she should decide. [ kittenlover2000's advice column | Ask kittenlover2000 A Question ]
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