Hi, I have a JRT and daschsund, as well as a new 3yr cocker.
I use small black kongs filled with treats or naturediet - then freeze it, or one of the best chew toys I have managed to find are nylabone dental dinosaurs!. Difficult to find in the UK, I have just had two order replacements from USA, but they have lasted well over six months, and that is really good going with my boys!!