A Border Collie that stays busy into old age still needs its food adjusted, because the dog's recovery and body composition change even when its enthusiasm does not. Keep the workload sensible, feed measured meals, watch muscle rather than just weight, and have your vet examine the dog at least twice a year.
Willingness is not the same as capacity
Border Collies do not retire voluntarily. A twelve year old Collie will still bring you the ball, still watch the gate, still get up at four in the morning if the sheep move. The behaviour is unchanged. What has changed underneath it is how quickly the dog recovers, how efficiently it builds and holds muscle, and how well it tolerates a hard day followed immediately by another one.
That creates a specific trap for owners of this breed. With most dogs, ageing announces itself: the dog slows down, sleeps more, asks for less. The owner notices and adapts. With a Border Collie the signal never arrives, so nothing prompts the owner to reassess anything, including the food.
The practical consequence is usually not obesity. Working line Collies in old age more often drift the other way, losing condition over the topline and hindquarters while the owner, looking at a dog that still runs like a young one, sees no reason to intervene.
Watch muscle, not just the number on the scale
Weight is a poor proxy for condition in an ageing athletic dog, because muscle loss and fat gain can offset each other neatly enough that the scale barely moves. A senior Collie can hold exactly the same weight for a year and be a meaningfully different animal at the end of it.
So check the things that actually change. Run your hands down the spine and feel how much muscle sits either side of it. Feel across the top of the hindquarters and compare left with right. Watch the dog get up from a cold floor after a long sleep, and watch it going up stairs rather than down.
The column on the right matters. Most of these observations lead to a vet, not to a bigger or smaller scoop. Feeding is one lever among several, and for a senior dog it is rarely the first one to pull.
Managing the work rather than fighting it
You will not talk a Border Collie out of wanting a job. You can change what the job is. Shorter sessions more often beat one long one. Scent work, shaping games and puzzle feeding tire a Collie mentally in a way that spares the joints, and for this breed mental work is genuinely tiring rather than a consolation prize.
Build in a proper warm up before anything fast, especially in cold weather, and accept that a hard day now needs a genuinely easy day after it. Owners who keep a Collie in work into old age successfully tend to be the ones who scheduled the rest rather than waiting for the dog to ask for it.
Feed around that schedule rather than on a flat rule. The same daily total split across a heavy day and a quiet day is fine; what matters is that the total tracks what the dog is actually doing over a fortnight.
What to feed and what is not published
Keep the recipe constant so you can read changes in the dog rather than changes in the food. Lamb and Beef is a gently cooked, complete and balanced adult recipe from My Perfect Pet built on lamb and beef with vegetables. Whether it is right for a particular senior dog, especially one with any diagnosed condition, is a question for your vet.
My Perfect Pet does not publish calorie content, guaranteed analysis or feeding directions on its website, so this article cannot give you a daily amount for an eleven year old Collie still working three days a week. The published figures sit on the printed pack, in the Nutrition Facts Sheet PDF linked from the product page, and in the weight calculator on that page. Use the calculator as a starting point and let your vet adjust it at the twice yearly senior check.
When something is not published anywhere, ask My Perfect Pet in writing rather than inferring it from another recipe.
The WSAVA global nutrition guidelines describe the nutritional assessment vets are trained to carry out, which is a good reference for understanding what your vet is doing at a senior visit.
Frequently asked questions
At what age is a Border Collie considered senior?
Many vets begin treating medium breed dogs as senior somewhere around eight to ten years, though an individual working Collie may reach that threshold earlier or later. Age bands are a prompt for more frequent check ups rather than a diagnosis, and your vet will tell you when to move to twice yearly senior appointments.
Should I feed a senior Border Collie less food?
Not automatically. A senior Collie that remains genuinely active may need close to what it always ate, while one that has slowed needs less. Adjust based on body condition and muscle assessed by hand over several weeks, and have your vet confirm the direction before making a large change.
Why is my old Border Collie losing muscle but not weight?
Muscle loss and fat gain can offset each other so that total weight stays flat while body composition changes considerably. This is why hands on assessment of the spine and hindquarters matters more than the scale in an older dog. Muscle loss warrants a veterinary appointment rather than a larger portion.
Can a senior Border Collie keep doing agility or stock work?
Many do, with the workload restructured rather than removed: shorter sessions, a proper warm up, and a genuine rest day after a hard one. Add mental work such as scent games, which tires this breed without loading joints. Ask your vet to assess fitness before continuing any demanding activity.
How much should I feed a senior Border Collie each day?
No figure can be quoted, since My Perfect Pet does not publish feeding directions or calorie content on its website. Take a starting point from the weight calculator and Nutrition Facts Sheet on the product page, check the printed pack, and have your vet set and review the amount at senior check ups.
Related reading: Feeding an Australian Shepherd Through a Working Summer and a Quiet Winter and Feeding a Senior Labrador Retriever: Keeping Weight Off an Older Retriever