[anonymously]

Swimming is easy on the joints and burns calories, even 3X a week might make a big difference.
Have you asked your vet about rehabilitation therapy, such as: “aquatic therapy in a heated pool and underwater treadmill, therapeutic laser, massage and mobility therapy and therapeutic exercise. Similar to human rehabilitation, our services include a complete medical evaluation specifically tailored to your pet’s condition, including home care instructions and education”. (excerpt copied from the site of a local vet)