Dogs and cats do not make vitamin D from sunlight
What holds for people does not carry over here. Dogs and cats do not synthesize vitamin D in their skin the way humans do; they take it in from their food. So this page calculates no vitamin D from sunlight. It adds up the daylight exposure you logged for one day and counts how many of eight observation items apply.
No published recommendation for daily daylight exposure in pets could be verified either, so no target time is set and your logged minutes are simply converted. Daylight still matters for settling the body clock and lifting activity, but treating it as a nutrition source does not match dog and cat physiology. Current as of October 2026.
This page names no diagnosis. It only changes the guidance by how many items apply: none, 1 to 2 (start with the home setup), 3 to 5 (a veterinary consult is advised) and 6 or more (an exam is advised). Lower activity and changed sleep show up the same way in pain, in thyroid or adrenal problems and in normal aging, so several items mean a physical exam comes first. When you open up a sunlit resting place, remember that next to glass can overheat, and leave shade to retreat to. This tool is for reference only and does not replace veterinary care. Contact your veterinarian right away if you notice symptoms or suspect a problem.
Frequently asked questions
Not in dogs and cats. They do not make it in the skin the way people do and take it in from food, so a suspected shortfall is checked through diet and bloodwork, not sunlight.
No published recommendation could be verified. This page sets no target and only adds up the time you logged.
That cannot be concluded. The same picture appears in pain and in endocrine disease, so disease has to be ruled out by a physical exam first.