The inside and outside part is made of soft and organic cotton for extreme comfort and despite regular washing and drying, it remains soft without sinking its size. (babieslounge.com)
Besides, this could also be a sign that the dog is infected with fleas, ticks, and mites, which can be controlled by regular washing. (petsinlive.com)
Never use hot water for regular washing, because it can cause the fabric to shrink. (thespruce.com)