May be "extreme" but definitely not labrador proof. Our lab managed to chew half of it in no time. She simply started at one end and snipped little bits off with her teeth, progressively making her way down. Our other lab didn't eat it, but got bored with it as the treats came out too easily.

The Extreme black Kong is great when we are working and the new dog is alone. Put peanut butter in the end with a few small biscuits then fill with a not too salty stock. Wrap in Glad wrap and put in freezer. Goes down very well in the hot weather.

I have a border collie x Kelpie who chews everything!! Have never found a toy to last more than a few days until the Kong! :) Stoked!

Excellent kong toy, really tough! The dogs love it!

my jack russell chews through EVERYTHING. this kong is indestructible and he loves it. highly recommend