How do I ask my mom and dad for a new dog????

I have no idea what research あなた did, but I can already guarantee あなた that guinea pigs are not もっと見る expensive than a dog. They're 食 alone is cheaper than dog food.

Also, did あなた ever stop and think the reason your parents are saying no is because あなた haven't been taking care of your dog very long, and あなた constantly keep changing your mind? That's great that あなた took care of your dog for a whole week, but what happens when あなた get tired of doing that? What happens when, 次 month, あなた want something else?

あなた want to convince your parents? Show them あなた actually want this. Take care of your dog, every day, for a month, two months, six months, a year. Then tell them あなた want another dog.

Hello,
first, I think あなた should ask them why they don't want a another dog. Then, あなた will find arguments against their opinion and explain to them why do あなた want one dog. But are あなた sure あなた can take care of a dog with your studies? It's a good idea あなた had (take care of your dog during one week) but can あなた do it everyday with two dogs? I have three イヌ and i 愛 them. We fortunately have a big garden. My medical studies take up all my time soI can't see them in the year.
The best solution is to ask to your parents a dog for your birthday.
When あなた will be in your own flat または house, あなた will be able to have every pets あなた want so don't be too sad if they still disagree.. Good luck!!

i will help