Dogs that have always been slipped ,in my opinion have no stamina
everything has stamina, slipping doesnt make a difference, if you are out working them or running them or walking them, or bke riding with them, putting them on a treadmill, all build up stamina, just because it was slipped doesnt mean it cant run
If a dog is always slipped 9 times out of 10 they are running flat out to their quarry they will look impressive but soon burn out after several good runs.It does not matter how fit they are nothing can last long running flat out. Even your musle tone changes (look at the di