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At 70 pounds that puts her at 127% of the max standard weight for bitches, so she is almost certainly overweight.
I'm in the camp that thinks that cutting back on the regular food is probably the smartest way to go. In weight control foods, you're simply paying for bulk. Cutting back on the food will do it, and if you want to make up some of the bulk yourself, unsalted canned green beans can do it (though they're not necessary).