Luna, my 6 month-30 lbs-lab/pitbull mix has had it for 10 mins, and has already chewed a couple of the strands to shreds!  I bought the kong wubba because of their reputation for being durable...which stands true with the other Kong products we own, but the material on this one didn't pass the "luna" test.  She loves it and it is a very nice alternative to chewing up our socks, but it doesn't look like it'll last much longer .  I'll still buy Kong products only but am a bit disappointed with this one...