Anything grain free, soft or hard doesn't matter as they really need to chew at this age. You can try bully sticks, trachea chews, beef sticks etc. also freeze dried treats are awesome as well. Just stay away from rawhides and greenies.
Why no greenies? We use them around here a lot and my dogs enjoy them. I know before they changed the formula there were issues with intestinal blockage but that's resolved.
Sorry to hijack your thread!!
(I know allllll about rawhide unfortunately)
Some dogs to well with greenies. Beverly was not one of them! She threw up every time I gave her one. The last time she chewed it until she could swallow a big hard chunk of it and before I knew it she was choking! Thank goodness she managed to get it out. No more for her.