I really want to get a dog. I've done everything to convince my parents, but none worked.. Help!!!!!

Some things to consider.
How long have you been nagging?
Have you asked why you can't get a dog?
Whats your climate like? Some dogs don't do very well in the heat.
How old are you? Your parents might not think you are responsible enough for a dog.
What is your house like? Most dogs require a big backyard. But small dogs are fine in a small yard.
Do you have very young siblings? A dog can hurt them accidentally.
Can you afford one? Dogs can get pretty expensive with vet bills, food, kennels(if you cant take a dog on a trip),grooming, toys. If you are old enough you could get a job.
Is someone allergic to dogs? If so poodles are a good option because they don't molt but require grooming often.
Maybe wait a few years. You never know a puppy could be coming your way for Christmas.

Please if you do get a dog try to adopt. And remember a dog is a lifetime(of the dog) commitment and you can't just shove it under your bed when you are sick of it.

Hope you do get a dog or even a cat.

Best of luck,
Beckey