In principle, the longer the pile of the carpet, the more it mottles. We can also do a test to get an idea of how long it will take before he stops losing his hair:we run our hand firmly over the carpet, then we look at what is left between our fingers and we compare with a neighbor carpet more expensive or with shorter pile.
Two criteria can be used to judge this. First, the material:the best rugs are made of natural fibers (wool). And the density of the wicks. To evaluate it, we weigh:the denser the carpet, the heavier it is. Logic. And the denser it is, the more it will resist wear.
It is true that a white carpet, it slaps. But it will quickly turn gray if you don't spend your time cleaning it. On a plain carpet, stains will necessarily be more visible (especially since cleaning can also leave traces). We therefore prefer rather small patterns, the ideal being heather, where the spots blend together, neither seen nor known.