what treats do you use for interactive toys?

[Mikelia]

Another question - now that all my dogs are on raw, I am trying to keep everything they eat simple. Used up all the dry cookies, multiple ingredient chewies etc... I am using canadian or american meat dehydrated treats (lamb lung, beef muscle meat etc) as general treats but what does everyone use to fill kongs? Interactive puzzle feeders?
One of my dogs needs a lot of stimulation to try to prevent her from licking her feet (hoping the new diet will fix this issue). I am planning to just use a high quality, local, horomone free, grain free kibble for the puzzle toys and sugar free peanut butter for kong type toys?
Was just curious what the hardcore raw feeders do for these kind of treats? It is near impossible to get dehydrated treats out of her favourite puzzle toy, they are too light weight and odd shaped to come out of the compartments.
Thanks again!