Ordered a large, and since we have no clue what piggies planks are, was not sure about the very large opening at the top.

Being inventive, my dog adores this and this will be a great introductory frozen feeder for incoming pups.

I first just wrapped the outside with saran wrap and filled with canned or prepared raw grind and popped in freezer.

Lovely frozen block that was more exciting and easier to reach the bottom than a kong. Cannot attest to chewing strength.

Also have popped in a hard boiled, peeled egg, then put an inch of canned tripe in to block the top opening. Covered top with saran wrap, placed upside down on dish and froze.

My dog LOVES this peeled egg cage! First feeder we've been able to try this!

We will probable freeze some sardines flat and do the same. She will love it!

Our 9 month old St Bernard Gamora loves this toy. So much so she has already used up the piggy planks for it and momma needs to get some more ;)

I have a 9 month old great dane and he loves this toy. Typically he will get bored of his toys after a short while, even if they have treats inside, but he continued to play with this toy until he managed to get all of the treat stick out. He also enjoys tossing it after he has gotten the treat and chasing it around, as it has a very erratic bounce. Overall, we are both very happy with this toy.

She loves this and likes to carry it around the house once done. This works well with most of the other treats as well.