Vitamin D is a crucial nutrient for both humans and dogs. It plays an important role in regulating the balance and absorption of calcium and phosphorus, which are vital for maintaining strong bones and teeth. People can obtain vitamin D from sunlight, but dogs lack the ability to absorb it this way. Dogs get vitamin D from their diet.
If your vet’s testing shows a vitamin D deficiency, only your vet should prescribe vitamin D, and determine the dosage. The FDA advises that Vitamin D is a fat-soluble vitamin, so unlike water-soluble vitamins, when a dog gets too much, the excess is not rapidly excreted in his or her urine. Instead, it’s stored in fat tissue and the liver. Excessive vitamin D can lead to kidney failure and even death.
That doesn’t mean dogs don’t need time in sunlight. It impacts a dog’s mental and emotional health. Exposure to natural light can help regulate a dog’s circadian rhythm, thereby improving sleep patterns and overall mood.
You’ve probably noticed that dogs love a good sunbathe, either outside or through the windows. Especially senior dogs, dogs with arthritis, and absolutely any dog on a chilly winter day.
Like people, dogs can suffer from the adverse effects of too much sun: Dogs with thinner coats are susceptible to sunburn, and exposed areas (such as the skin on the end of the nose) can develop skin cancers. They can of course also get heatstroke. So like people, moderation is key. Dogs need shaded areas and should limit sun exposure during peak sunlight hours, especially in the heat of summer.
In summary, while dogs and humans differ 
how they get their vitamin D, time outside in sunlight is just as important for dogs’ wellbeing as it is for people. Outdoor activities are vital for mood, physical stimulation, maintaining a healthy weight, vitality and happiness.
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