Well if she is drinking for quite a while and then goes back again and again and drinking for a longish time at each time and this goes on for days, thats excessive. Weller will sometimes drink for a long time, particularly if he has eaten something dry but very often it just little and often. Is she emptying her bowl?
There are lots of environmental influences that can affect her thirst, exercise, dry food, treats, heat.
The best way I can think of to describe excessive thirst is that it seems unquenchable, no matter how much water she drinks. If she is just drinking a little more, i would say not to worry but if she has an insatiable thirst there may be a medical reason. I think you would know the difference Colin, try not to worry too much.
