During one phase of the trial, the canine patient presents with stools that are abnormally dry, firm, and fragmented. Suggest one physiological reason for this presentation.

Following a sudden change in diet, the same patient produces highly watery, liquid stools. Suggest one physiological cause for this condition.

Describe the physical mechanism by which a bolus of food is actively transported along the mammalian digestive tract.

Identify the specific anatomical structures of the mammalian gut where faeces are: (i) temporarily stored prior to elimination. (ii) actively expelled from the body.

Explain how the process of egestion differs from the process of excretion in mammals.