Say to your mother that you will walk the dog everyday and you will do all the chors in the house for a year also feed it and wash it:)
you clean, work hard buy them stuff and do not......DO NOT.........get in trouble.
beg for three months staight, then cry, then if it doesnt work, buy her one 4 xmas... yeah for HER!
She probably forgot to go shopping to buy her dog a bone.
Tell her you are responsible
You CANT
Buy your own
no
Your Mother has the final say in this matter but why not set down with her and nicely ask her if both of you could put down in writing the pros and cons of each type of dog you both want. You both need to educate yourselves on the specific breed you want. Then compare your papers and see which dog rates the best for what you both want in a dog.
You can convince your mother by letting her know that you are responsible.
A mother dog is called a dam.
Brownose
You should turn on the charm.