Signs of over-exercising in dogs include stiffness and sore muscles, exhaustion after exercise, and slowness or lagging behind during exercise. If your dog is stiff during or after exercise, if they struggle to get up steps or jump, they have probably had a little more than they can handle. You’ll need to make sure they have gentler walks and activities for the next couple of days until the soreness eases. Whilst it’s not uncommon for a dog to go and have a snooze after exercise, it may have been a bit much for them if they stay that way all day. If your dog is lagging behind or being noticeably slower during exercise, it can be a clear sign that they are struggling, especially if they are normally out in front. Heat exhaustion is also a sign of over-exercising, and you should watch out for warning symptoms such as excessive panting, confusion or lack of focus, and glazed eyes. If you think your dog might be suffering from heat exhaustion, immediately move them to a cool, shaded area, give them water, wet a towel for them to lay on and let them take a dip in a body of fresh water.