These have a hollow middle and work well with your regular stuffing mix, or you could plug and end, add some dried, and then plug the other end. Your choice!
This is the official blurb from Outward Hound:
The strong and sturdy shape of this Bionic Bone satisfies your dog's desire to chew and stimulates their senses with thick ridges on all major chew points of this bone. The bright colour of this treat stuffing toy makes playtime even easier to spot! Bring extra excitement to chew time with two treat pockets at each end of the bone. You'll feel good about your dog chomping and chewing for hours on this Bionic Bone that is naturally free of all the stuff you don't want your dog chewing on like lead, BPA and phthalates. Its unmatched durability makes Bionic super strong and super fun!
NO BPA OR LEAD: BPA, lead and phthalates have no place being in dog chew toys, that’s why Bionic chew toys and the Bionic Bone are free from all the bad stuff you don’t want your dog chewing on making chew time more fun.
BONES WITH BONUSES: Bionic Bones are made with 2 pockets perfect for hiding your pup’s favourite treats and are great for stuffing with peanut butter and other tasty favourites.
TOUGH TEXTURE: Ridges make chew time more fun and help dogs satisfy their natural urge to chew! Each Bionic Bone is made with durable ridges that dogs love running their teeth over keeping them occupied and satisfied.
EASY TO CLEAN: Toss the Bionic Bone in the top rack of your dishwasher to keep this chew toy clean.
BRIGHT BONES: The Bionic Bone is available in 3 popular colours: orange, purple and green. These bright colours are easy to spot no matter where you take the Bone and every cool colour makes your dog’s playtime more personal.
- SM: 4.7" L x 4.7" W x 2" H (Recommended for Dogs 20 lbs and Under)
- MD: 5" L x 5.7" W x 2.7" H (Recommended for Dogs 15-35 lbs)
- LG: 5.7" L x 6.5" W x 3.2" H (Recommended for Dogs 30-60 lbs)