Hi K-Rae,
When feeding high protein diets you are supplying protein in excess of needs. The “excess” in broken down and used for energy. The nitrogen has to be excreted and this requires water to do so. I’ve commonly seen it reported by people on this site that when they switched to a high protein food that they noted their pet was urinating a lot. I searched on “protein dehydrating” and found quite a few articles that discussed this.
That said any change in your pet is a reason for seeking vet care.
