My Katie is a digger, then rips as soon as a speck of fluff appears. The only bed I have never replaced is Duluth Trading Company dog bed. Outer shell is like iron!! Washes well and is water/pee/skunk smell proof so the inner shell has never been damaged. I replace the innards every couple of years with some cedar chips (small bag of rodent bedding from a pet chain) and batting from walmart just to keep the bed fluffy and warm. I go to Salvation Army or Goodwill for baby blankets to cover it with (50 cents apiece and I don't care if the digging/nesting damages it:))
They cost a bit more than your average dog bed, but in the long run I've saved a ton of $$. I replaced 6 of Katies beds before the Duluth. Best thing, it's big enough for the 2 Basenjis to share so it saved space as well.
The one necessity I can't live without is the pint size stainless water bowl. Not big enough for the all-day fresh water, but perfect for my bedside table and keeps the dog spit out of my bedside water glass.:D I just have to figure out how to keep them from walking on me if they get up for a midnight slurp;).