Fluid given under the skin is not immediately put into circulation but is held there until it can be absorbed by the body, and urinated out if need be. Excess follows the course of gravity and settles in the feet and underbelly until it can be absorbed into the circulation. Usually a cat is given 50-100ml at a time, but as you have seen, a great excess is not detrimental. If it is given directly into the circulatory system, as in an IV, it can cause a fluid accumulation in the lungs, but not when given subQ. The worst that would happen is that the cat would have to carry around all this extra weight.

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