yeah, Im just trying to think of how to stimulate his brain and make him think..
I've also definitely considered some of these toys. One thing you might consider is a "buster cube" which can be found at pretty much any Petco/Petsmart. I got one for Pimg, and she really didn't care much for it. I think something to consider is how high a value of treat you can load the toy with. Some of those toys can put pretty much anything (like NB roll, i.e., "doggy crack") and as such, the dog will likely enjoy it. Others, though- like the Buster Cube, need something hard like kibble. My dog didn't find that overly entertaining or stimulating. So just some thoughts there... if your dog requires pretty high-value treats for "new" things, then you might want to consider how well the toy will work with such sticky (non-hard/dry) treats.
Also- I've been using a normal Kong lately stuffing it with either peanut butter or NB rolls (cut up, of course). You can stuff the NB roll slices in the kong in such a way that it is really not easy to get out. Pimg will spend 15mins or so on this! Peanut butter is great too, but her loooooong tongue has little problem getting it out. It probably lasts 5mins or so.
[EDIT] Rereading this- I am not sure I made my point on the Buster Cube. It is about $10 to buy compared to the $60+ Nina toys... I'd rather find out my dog doesn't care for a $10 toy than a $70 one.
RATCHX3 High Jinks vom Neuanfang - Gotchya Day: 1/23/2013 DN, SG, SR, CA
Inspire Spark to Ignition! (Ignite) Gotchya Day: 10/8/2016
C-ATCH Pimg - RATO, UJJ (x2), DJX, HIT, CA, CGC, High in Games, Reserve High in Standard- CPE Nationals 2014