★★★ (Light Diggers) 15k-24k DR
★★★★ (Medium Diggers) 25k - 49k DR
★★★★★ (Aggressive Diggers)- 50k+ DR
Double Rubs (DR) is a method of testing abrasion tolerance. It is tested by doing a back and forth motion until two yarn breaks occur or there is noticeable wear to the fabric. Each back-and-forth pass is known as a Double Rub. Anything over 15,000 DR is considered heavy use.
The seat where your pet rests is where durability matters most and where digging is most likely to occur.