By doing jobs around the house and asking nicely while providing a reason why you would like another dog
give reasons on why you should get anothertell them how responsible you'll become up with ideas on how to handle the dog money wiseand show how responsible you are with the first dog you have
You can convince your parents to get you a dog by telling them how your school research work demands the same.
You just show your parents Responsibility... What every parent wants there kids to have!
start out asking for a small animal
Enlist them.
I hope you have your own house if you are 20.
Tell your parents you want a dog.Then tell them what kind of dog you want.And if you act all responsible and do your chores without being asked to that will show your parents you are responsible for even a DOG!
you clean, work hard buy them stuff and do not......DO NOT.........get in trouble.
tell them they will love them even if they tell them they can't have something
I am trying to convince my parents to let me get a third dog my best suggestion is to take care of the dogs as best as possible and maybe it will work. If you can be responsible with the dogs you have they might trust you to take care of another one. Wish you all the best.
Convince them that you will take care of them and do anything for them if they ask
If you already have a dog that is wild, (as in out of control) then you most likely aren't fit to raise another dog. While puppies are cute, they are not toys. They are living animals with needs and you need to look after their best interests. If you can prove to your parents and your current dog that you are responsible and able to care for and spend a lot of time with your animals then they may reconsider.