All interactions are between the puppy and the bitch and are related to warmth, feeding and elimination of waste products. (safarivet.com)
For the first three weeks, the mother cat will lick each kitten around the abdomen and anal area after nursing to encourage elimination of waste. (thesprucepets.com)
Additionally, when elimination of waste and toxins through the GI tract is impaired, which occurs with chronic constipation, the skin is forced to pick up the slack. (elixiawellness.com)