This is my purebred doberman's longest lasting toy (it still exists). I rarely buy her soft toys because it's pointless, they don't last.
It's so strong we can play tug with it. Whenever she wants to play, she brings it over in her mouth. She holds the one end and leaves "extra" room for my hand to grab and then keeps bringing it back to play tug with over and over again. I can even lift her up with it, she won't let go.
The only thing is she gets no satisfaction from not being able to destroy the toy, but in terms of it's quality - it has lasted us!