I hope that we are not being rude, and you sound like a very responsible person, it's just that your life will be changing as you get older. You will want to spend more and more time with your friends and less at home, then maybe to college or university, then work. You can expect to have the dog until you are maybe 27 or 30 years old and by then who knows if your day to day life will be one that a dog fits into. So if your grandparents are prepared to take over the responsibility when you cannot, that is fine, but if they are not, then what would happen to the dog? Why not discuss it with them? Also, cockapoos demand much more exercise and attention than many other small dogs, so if you have any doubts about how much time you can give, maybe consider other breeds.
i compleatly agree i was 18 when we got Gypsy, and was upset with my mum as i flet she decided to get a dog at the point when most would be making plans to move out, but after a couple of months to a year i relized at a couple of year before that i would not have been responcibal.
what are your finances like
the cost of a cockapoo can be anything upto £850
insurance for my lot each ranges from £9 to £15 as it goes up every year as they get older.
inoculations/vet cost/nutering(all cost money and cam be exsortonet depending on your vet)
puppys can be distructive, so you need to be vidulent and keep exspencive thiongs out of their reach.
grooming you are looking at £30(i know someone who pays £40) every 6 weeks to keep your cockapoos coat trimmed, not to mention the time grooming to keep it mat free. the first 7 months are a dodal, as their coat doesnt matt.
food depending on the brand you could be looking at maby £10-20 a week.
it is basicly like having a child as you have the posobility of having the dpg for 15 years, kennels cost alot too if you want to go away and cant take the dog, you are looking at £11 per night.
realy sit and talk with, then leav it and theink about it and come back to it later to talk again.
let us know how you get on.