[hcelsa]

I do agree that every dog is different, and it's most important to do what's best for your dog. That said, it's extremely important for dogs to stay active regardless of age (it's a health thing). My vet friend is convinced that dogs that are mentally and physically active show fewer signs of aging in general, and have stronger immune systems.

I have two dogs that will be 9 in June and they'd drive me nuts without a good workout on a regular basis(generally they herd sheep, work on their obedience, and/or do agility at least 4-5 days out of the week). I also try to get them swimming at least a couple times a month to help maintain flexibility and get a really serious low-impact work-out in (they're both happy to take it easy the day after a good swim). I'd definitely be getting them in for bloodwork if they suddenly didn't feel like going and doing.

How is your girls weight? If she's become a bit more sedentary she may have put on a few pounds and that will definitely affect her exercise tolerance (even an extra pound or two isn't good). If that's the case reducing her food a bit will help get her back in shape and feeling more chipper.