Our Calico cat of almost 20 yrs passed away from typical old age complications last year. She always followed us on walks. Even when she was very old and just too feeble to keep up, she still tried her best, but I didn't stress her at all; I'd gladly pick her up so she always accompanied us on our walks, regardless of who was actually doing the walking; she or me. During the walk, she loved to get plopped down for a brief trot and then she'd 'accept' my offer to carry her for the most part in the last years.
She came to us from a friend who kept her sister, a similar Calico, as both were mostly white with splotches of brown and a few tiger stripes thrown in here and there. She outlived the sister by more than a decade and also seemed to be part dog since I'd hear her growl if someone or some other animal approached. This was always surprising to hear. She never liked dogs or other cats at all, being soley devoted to me and almost as loving toward my wife as well; a trait I've heard mentioned in reference to Calicos.
Finally, I'd like to add that although she was ferociously mean toward all animal intruders, she never hissed or growled at us at all, being the fiercely loyal defender of the household, yet the faithful, loving family member. As an aside, her life might have been shortened by a cat life or two when she tore into a bag of fertilizer, way early in her formative years. We swore we had no idea what made her so sick when asked by the vet, but we eventually found out, well after the incident. Please be sure your cats have no access to fertilizer, as they sometimes mistake it for a bag of cat food, or at least percieve it as a food item which is actually very poisonous.