Below are common causes for exercise intolerance in dogs this age. If you still seek further information, please visit our Ask The Vet page to submit a one on one consultation with a licensed veterinarian 24 hours a day, 7 days a week.
AV Block
Congestive Heart Disease
Heart Murmur
Heartworm
Hypothyroidism
My 9 year old labrador has becpme very slow when we go walking and keeeps stopping she limps on ond off also walks like her feet are hurting we have checked them for visable problems she pants very heavily even when just walking