Particularly in cases where the condition is likely to be temporary, a supplement might be recommended to add the right kind of fiber in a controlled dose to your pet's diet. (wileypup.com)
Can you point out what kind of fiber do they like as well? (nutritionfacts.org)
They have three different kinds of fiber in its wool: soft underwool (gentle waves and shine), awn fluff (crimped with a hooked end) and awn hair (guard hairs which are strong and straight). (petguide.com)