Mike,
Pretty 4 pack of pooches. I understand where you are coming from. My Britt female, 7 mos., is up to 35 lbs. and I have been letting her tow my fat a$$ around on a bike 3 miles a day for the last 2 months when morning temps are in the 70s. It helps keep her spring from being too tightly wound the rest of the day.
Best,
Gil