There Are Many WaysTo Exercise
Walking is a low-impact and aerobic exercise which is suitable for most older dogs, but there are many other options too.
It's not a good idea to start a totally new 'sport' or exercise regime for an elderly dog, but if there is something that he's always enjoyed then you don't need to give it up just because he's older. You may just need to alter the way you play.
Fetch, Frisbee & Tug-of-War
If your senior dog has always enjoyed a game of 'fetch' or 'frisbee', he may well still be able to have some fun with his favorite sport as long as you're careful.
In older dogs the support offered by legs and hips varies and can decrease, so always be very careful with jumping to catch a ball or frisbee.
You can still throw them, just make sure the trajectory is low enough so he can catch whatever it without leaping off the ground. Also, keep games short and stop as soon as you notice your dogs' energy levels flagging, he slows down, pants heavily etc. Make sure that there is plenty of shade where you play and always offer lots of fresh water to keep him from getting dehydrated.
Again, be sure that the area where you play is level and has good footing for your dog. No potholes, hills or ditches please.
Swimming
Swimming is a great choice when it comes to exercising senior dogs.
The water helps to support their weight, giving old joints and ligaments a rest while still allowing muscles (including the heart) to exercise and improving blood flow.
If you have a pool or live near a lake then taking your dog for a regular swim or paddle along can make be a great benefit to his overall health and fitness.
Of course, as with other types of exercise, use common sense and make sure your dog is enjoying himself and not overdoing things.
Only let him swim outdoors in warm weather and dry him off quickly so he doesn't get chilled. If you have access to an indoor pool it can be a year-round activity but the rules of preventing a chill still apply. Keep swim sessions short to prevent over-tiring your dog, supervise him closely at all times and never force a dog to get into water if he doesn't want to.
If you have a pool it's also a very good idea to install a doggie-ramp or steps so that there's always a quick and easy exit for him.
Do bear in mind that older dogs are less mobile than younger ones and that he may need a little help with entering and exiting a pool.
Therapy Exercises For Senior Dogs
For some older dogs even the more routine forms of exercise such as walking, playing or swimming are just too much for their bodies to handle. But this doesn't mean that they don't still need to move/use their muscles, joints and ligaments. In fact if they don't exercise in some way then there will simply be a degeneration of tissue and mobility which is never a good thing.
This is where physical therapy comes in and if your elderly dog fits this scenario ask your veterinarian if he/she can recommend a canine physical therapist. Alternately check your local listings for Canine Physical Therapy & Rehab Practitioners.
Massage, stretching, muscle-strengthening exercises, hydrotherapy and more are often offered and can make a huge difference to your senior dogs' overall health and quality of life.