"Fiber supplements" refers to products that contain a concentrated form of dietary fiber. These supplements can be taken to provide additional fiber to your diet, helping with digestion and promoting overall health. Full definition
If you can't physically take in as much food for whatever reason, then consider taking fiber supplements. (lowcarbalpha.com)
You could try a soluble fiber supplement for a few weeks to see if it helps. (drcate.com)
While this may be the thing to turn your dog's health in the right direction, you need to determine whether more help is needed such as fiber supplements. (thebarkbuzz.com)