I have 2 of them and I cant find any info on them.

They're weapons. I'm also assuming that they heal your pet.

Heres what you do: Go to veta Lake, Go the the Adoption Agency, get a Ruffie, Equip the bones to your Ruffie, Go the the Battle coliseum, Challenge Willowwisp, Use the Bones in battle, then post what was to the left of the bones description in battle here :)

I assumed that too, but a full heal or a percent and are they breakable or not?

Ta dah! :D