We have a 4 month old and we try to take her for walks daily. She goes for a 10 minute walk at lunch time after being cooped up in crate most of the morning. Then we go on a 30-40 minute walk after we eat dinner. If we don't take for a good long walk she goes nuts in the house. Are we doing her harm? She doesn't seem to mind it and she is learning not to pull. We use a Martingale collar which is a limited choke which doesn;t cinge up or lock like the metal ones do.