ask her to get 你 a small pet and be responibal with ans maybe she will. 或者 even better ask her if 你 can volinteir to take care of your neighbor's dog why shes away 或者 sick and do a good job and maybe she will relize your recponcibal.
mlynn101 made a good point about taking care of a friend's 或者 neighbour's dog to prove that 你 can do it. It'll also be good experience for you. In fact, I recommend that over the option of getting another pet first. Different species require different types of attention so if 你 specifically have experience with 狗 then that'll be great!
Another important thing to be aware of when thinking about getting a dog is how much time they require. 你 should make sure 你 will have enough time to do everything 你 need for it; it's worth doing some research into the breed of dog you're thinking about and finding out exactly how they need to be looked after (as some breeds require 更多 attention than others).
Lastly (and this is important when adopting any animal) 你 need to be sure that 你 won't get bored with a pet. For some, owning a pet is a novelty at first, but eventually they lose interest and the animal is then not properly looked after. This is where 前一个 experience with owning 动物 is handy, just so 你 know that for you, looking after a creature is a lifestyle and not just a pastime 你 will get bored with.
