I don't know if it matters, but the run my husband made for our three seven week old girls is very long, but not terribly tall. Somewhere between 2 1/2 and three feet tall. I know that it doesn't matter much since they are still small, but what about when they are full grown? I have an Australorp that looks like she'll be a big girl, an Iowa Blue who is supposed to be smaller and an EE. Any advice?