I have a female 20 month old. from 6-12 months she went to a dog park daily, approx 1 mile walking plus playing. for the last 10 month she has been walking approx 3 miles per day. I am now being told she is getting two much exercise. how much is too much? how far should I be walking her? she always wants to go out and never wants to go home but walks very slowly and usually walks behind me not besides me. she has done this form the start. I appriciate the help. JO