Can too many liver treats cause any problems? I am trying a new treat (all it is is freeze-dried beef liver chunks) and the container recommends 1-4 treats daily depending on the size of the dog. She absolutely loves them, though, and it is making her training on some new things go much faster. When I am trying to get her to learn something new, I treat a lot, and don't want to cause her any problems.

Besides making her fat, can the liver cause any problems for her? How much do you guys think would be too much?