Also sometimes the scales can be off. Last time i took Uni to the vet, the tech weighed her and said 4.3 or something like that. I said what? no way. We weighed her again on a different scale and she was closer to 5 1/2. So that's a big difference. When they move around or don't stay still the scale will not read correctly.
That's why i stay away from scales myself, b/c I don't agree with what it says.