As pets get older, their diet often becomes a topic you and your vet revisit more carefully. This page is general information only. It is not veterinary advice, and nothing here should be used to diagnose, treat, or manage any condition. Choices about senior nutrition, and especially any therapeutic diet, should be made and monitored by a licensed veterinarian who knows your individual animal.
What tends to change for senior pets
There is no single age at which a pet becomes "senior." The timing varies by species, breed, and size, and your vet is the right person to decide when, and whether, to adjust anything. In broad terms, some households find that an older pet's activity level, appetite, and body condition shift over time, and a vet may talk with you about how those changes relate to daily calories or portion sizes.
You may also hear vets discuss areas such as joint comfort, kidney function, weight, or dental health when they review an older pet. These are complex topics, and how they apply to your pet, if at all, is something only your vet can assess through examination and testing. Treat any general mention of these subjects as a prompt to ask your vet, not as a reason to change food on your own.
Senior maintenance foods sold normally
Separate from therapeutic diets, many ordinary pet food brands in Japan sell "senior" or "high age" (シニア / 高齢) maintenance foods. These are complete daily foods marketed for older pets and are available through the same channels as regular food: pet shops, home centers, supermarkets, and online retailers. They do not require a vet's authorization to buy, because they are everyday maintenance products rather than therapeutic diets.
Because labeling, life-stage wording, and formats differ between brands, it helps to read packaging carefully and to compare options. If you are weighing a senior maintenance food against your pet's current food, your vet can tell you whether a switch makes sense for your animal and how to transition gradually. Comparing labels and rough monthly cost is also easier when you can see the numbers side by side.
Feeding amounts vary by product. Follow the package and your vet.
You can estimate what different foods might cost per month using our pet food cost calculator, and see general buying notes on our dog food in Japan page. Our main pet food overview explains how the different food categories fit together.
How prescription and therapeutic diets (療法食) work in Japan
Therapeutic diets, known in Japan as 療法食, are a distinct category from ordinary senior maintenance foods. They are formulated to be fed under a veterinarian's direction as part of a management plan the vet sets, and they are usually sold through veterinary clinics or dispensed on a vet's instruction rather than picked off a shelf and used casually.
The important point is that a therapeutic diet is only appropriate when a vet has determined it is appropriate, for a specific pet, based on that pet's examination and needs. The same product can be suitable for one animal and unsuitable for another. Feeding a therapeutic diet without veterinary direction, guessing at which one to use, or continuing one without follow-up is not something you should do on your own.
If you think your pet might need something beyond ordinary food, do not try to self-select a 療法食 from what you read online, including this page. Book a visit, let the vet examine your pet, and follow the plan and monitoring schedule they give you. Any adjustments to a therapeutic diet, including starting, changing, or stopping one, belong with the vet.
Buying, storing, and cost notes
For ordinary senior maintenance foods, the practical questions are the same as with any food: how much your pet eats per day, how the package size affects cost, and how you store it to keep it fresh. Our calculator can help you compare those everyday numbers across products.
For therapeutic diets, purchasing and cost are secondary to getting the right product for your pet in the first place, which is a veterinary decision. Ask your clinic how they dispense the diet, how often they want to recheck your pet, and what to do if your pet's appetite or condition changes.
Bottom line: this page is general information only. It is not veterinary advice. Any decision about senior nutrition, and every decision about a prescription or therapeutic diet, should be made and monitored by your veterinarian. When in doubt, talk to your vet.