The bif of plant fibre here is an attempt to replace that. He regularly appears on UK television. It is most likely the dog is dry fed as he has anal gland issues as pelleted dry food increases the water content of stools Stroucken et al. Domestic animals like dogs and cats have largely lost their ability to empty these glands voluntarily - unlike the skunk's world-famous pungent defence mechanism. So if you didn't know anything about your dog's anal glands before you read this article, you probably know more than you ever thought possible now! Not present in humans, they are paired sacs located precisely just below the surface of the skin between the external and internal sphincter muscles, employed by nature to produce a particularly thick, foul smelling, oily liquid secreted by glandular tissue for identification and territory marking. Under most circumstances, anal gland secretions are extremely minute, so you don't usually see or smell them - though you may notice your dog's bedding becomes a bit smelly between washes.
Journal of the Science of Food and Agriculture, 71 4:
Too Many Soft Poos is the Cause of Anal Gland Issues in Dogs…
They should be relatively firm and easy to pick up, leaving a slight residue. Other signs include licking or biting around their anal area, chasing their tail, sitting uncomfortably, or even licking paws - both front and back - in sheer frustration. However, infection can result from prolonged impaction giving the glands a chance to build up nasty bacteria resulting in pain, increased swelling and, sometimes, even abscesses and fever. Remove all these and feed a biologically appropriate fresh dog food. This is the reason dogs smell other dogs' bottoms when they meet and greet, standing tense with tails erect to swap their own unique smells rather like individual fingerprints.