Probably won't hurt. 1/2 cup of milk isn't a lot for a dog that size, so it shouldn't cause problems. Boiled eggs give my dogs gas (bad!), but if she doesn't have those problems there shouldn't be an issue. Eggs can be given raw as well (less likely to cause gas). Most dog treats are a million times worse than fresh milk and eggs (Beggin' Strips? Pupperoni? Ugh. The ingredients are trash).