I don't think you have anything to worry about, Masha.
I know when I switched my dogs to raw I was shocked (and somewhat concerned) over how little water they drank, turns out it's normal as they get the water content they need from the raw food (or, in your case the wet)
My babies: Sassy - Maltese X (9), Furby - Shihtzu X (7), Brynn - Boxer (3), Diesel - Boxer (1)
"Many of the Earth's habitats, animals, plants, insects, and even micro-organisms that we know as rare may not be known at all by future generations. We have the capability, and the responsibility. We must act before it is too late." - Dalai Lama