A) This is a perfectly normal trait for any animal that is fed dried food. You should always supply ferrets with sufficient facilities to obtain plenty of fresh drinking water, especially for the first few weeks after changing their diet. During the winter, when I feed my ferrets entirely on wild rabbit they seem to drink almost no water as the moisture within the meat satisfies their thirst and fresh drinking water is almost untouched. When you exchange a natural diet for a dry one, the animals then drink far more water to fulfil their dietary requirements. The main advantage of feeding a biscuit diet is that the food does not attract flies, nor does it decompose if hidden by the ferrets during the warmer and longer days of summer.