Along with dogs aging comes a decreased ability to do things they did when younger. If you have an older dog, you may have noticed. There are few causes for this. The most common reason is arthritis.
Some symptoms are stiffness, limping, favoring a limb, or reluctance to jump or climb stairs.
Most dogs with arthritis will lie in one place not moving unless absolutely necessary. Another cause is that older dogs have less energy and desire to run about and exercise. If the dog lies around all day, his muscles will begin to deteriorate, thus leaving him weaker to cavort. This is very commonly the cause of lack of mobility in older dogs. That's why as a dog's owner and caretaker you must make sure that it he gets plenty of exercise.