My 1 year old rottie destroyed the "extreme" big black kong toy that holds treats in 10 mins and also the kong bone shaped treat toy in 20.
I was very disappointed because they said they were good for "power chewers!"
Wow, I'm sorry to hear that. I have black Kongs that my Rotties have played with for months on end... and they're pretty aggressive with their toys :(
You might want to try the Orbee Tuff range of balls, some XL size natural antlers or the West Paw range of toys made from Zogoflex. They're all featured on my Indestructible Dog Toys page.
If you find something that really works for your Rottie, please come back and share it with us here!