How much should a miniature dachound weigh at the age of 5?

I have a miniature dachsund myself and they only get to be about 12 pound at the most. Regular dachsunds would get up to 15 pounds. My dachsund is small for a miniature and she will get to be about 7 pounds 10 at the most. But you have to watch how much they eat because these type dogs are prone to being obese. If given a choice they will eat and eat and eat.