Scraps
Source: Drop. He's one cowardly companion, because he's got no guts... Undead type. The chest keys are 2000 nethershards each, although you can get nethershards in them.
Scraps 
is a Legion undead pet dropped from Wyrmtongue's Cache chests, opened with 
Wyrmtongue's Cache Keys purchased from Treasure Master Iks'reeged for 100 Nethershards each.
Guide awaiting review
Complete the Quest Chain
Complete the Spiders, Huh? quest chain to unlock the world quest Treasure Master Iks'reeged and access the vendor Treasure Master Iks'reeged.
Earn Nethershards
Gather Nethershards to afford Wyrmtongue's Cache Keys — each key costs 100 Nethershards from Treasure Master Iks'reeged, and a world quest also rewards 100 Nethershards plus a key.
Open Wyrmtongue's Cache Chests
Use your keys to open Wyrmtongue's Caches; Scraps has a low drop chance, with one player reporting it dropped after approximately 50 chests.
Check the Auction House
Scraps is tradeable, so it can appear on the Auction House if you prefer to skip the farming process.
Tips
Scraps is an undead pet in the Canine family, making it effective against critter-type pets in battles where you would normally rely on an undead pet.
