Never!! when my kids were under the age of 16. they had better things to do than take on the responsibility of raising any breed of an animal, they have to hang out with friends, go play all day, Party, places to go friends to see.. Mom raises the pet "But" when they get home and done socializing, the pet becomes theirs again, almost like a toy that sets on a shelf and taken down to be played with and put aside again only to be repeated.. I am not speaking of all children Just "MINE' I have five children (now adults) and I had all of them with wanting their very own pet. and only allowed fish and hampsters. of course I had to clean it's cage and feed the fish
So I never allowed them to take on the responsibility of raising their own dog. Dogs are babies and they grow up just like children and have to be raised as such.
so I just dont think any child (only a opinion)
that old should be raising such a responsibilty. there are exception's some children can be very responsible to love and take good care of their pets. but not Mine
My Children had to socialize 24-7