The omega paw one smartrock listed Hemi chewed right through it in a day. However other people have really recommended it. I had not luck with it.
However the Kong wobbler is a fantastic one and yes it fits from food. It is tough as well, Hemi got his when he was a puppy, still has it.
One of the best ones Hemi has is this one, I had a heck of a time finding it in my amazon orders. I bought it back in 2013 and it is till going strong. Its hole does have some like crosses in it so you can cut it to size to allow the kibble top come out. I just cut one prong off the cross and perfect for fromm
Pet Supplies : Pet Toy Balls : Treat Dispensing Chew Ball, Large : Amazon.com
Another good one was this one by busy buddy. You have to make sure you screw it down tight though, it actually screws down and then you have to go a little farther and it locks in place. This is another one you cut the hole to size.
https://www.amazon.com/PetSafe-Kibbl...buddy+dog+toys
New one he got this year, so can't say for sure on durability. But so far so good, he plays with it even when it is empty. He has manage to completely move the inner green piece and throw it all out of whack, which honestly I am ok with he made it harder on himself.
Amazon.com : Planet Dog Mazee, Green : Pet Toy Balls : Pet Supplies
Those are the best ones Hemi has. He has probably 20 of these different things to hide supper in. He has to work at them to get them out. If you really want a challenge what I do to Hemi is I lock him in a bedroom, fill up all his toys putting a little biut of food in each one and then I hide them in different rooms. I always take one back to the bed room when I let him out because he takes off running he knows the game is on. So then I set the one I carried with me somewhere in that room as well. :dog: It can take Hemi sometimes an hour to get his entire supper. He loves the game, I figured this out back when I was taking some classes he was young and we had that super long winter a few years ago. He is panting by the time he is done, he has run all over the house. Classes and winter snow took up a lot of my time.