How I stuff my kongs.
The way I stuff my kongs is very easy. I mostly just use wet dog food and kibble. I pack some kibble in first to cover the small hole then I add some wet dog food. Then more kibble and wet dog food until it's completely packed in well and I put them in ziploc bags and freeze. Right now they are loving the Merrick foods. My favorite Merrick wet food is the Turkey pot pie. It works really well for stuffing kongs.
There are a lot of recipes out there for stuffing kongs. The way I do it is what's easy for me. Here's another way to do it:
I don't generally give my dogs commercial dog treats, though and I prefer sticking with what is healthy. Occasionally they will get a high quality biscuit in there but not very often. You just have to find a recipe that works for you and your dogs.
I think kongs are awesome for keeping a dog's mind busy. I really recommend them if you have a very active dog who always needs something to do. There are also other puzzle toys you can buy for that as well. My dogs get kongs if I know I'm going to be busy and I can't do a training session or if I have to take one of my dogs away and leave the other one.