Yes you can eighter kill wolves for their bones or you can buy them at the grand exchange.
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You can bury them for pray xp or use them to make spirit wolf and wolpertinger summoning pouches
The place where you complete wolf whistle has a basement. In the basement, there is an infuser thingy. Use a pouch and wolf bones (If you are level four) on that infuser thing. It will infuse the pouch giving you a spirit wolf and you will get summoning exp.
Kill a skeleton to get bones. You can right click a wolf with bones to tame the wolf. It might take as many as three bones to work.
By taming a wolf. Wolf taming can be done by right clicking a wild, non-hostile wolf with bones. Give bones to the wolf until heart particles pops out of the wolf, then it will be yours.
The logical answer would be to pick it up again, and use it to finish the quest. ------------ In the case that it's lost from dropping, You would have to make a new one using Wolf bones + 7 Shards.
The best place to collect Wolf Bones IMHO, is White Wolf Mountain - The Mountain that Links Falador and Catherby.
left of white wolf mountain
In White Wolf Mountain.
Buddy is the Best........I got 90000000000000000 bones .
Buddy is the Best........I got 90000000000000000 bones .
Depending on the length of the tail, around 320 bones.