If a dog does not get sunlight for a long time, it will suffer from calcium deficiency and may also develop skin diseases. It is best to take the dog out to bask in the sun every day. Dogs need to bask in the sun every day, otherwise the body will lack vitamin D, resulting in weak legs; and lack of sun exposure will breed bacteria and fungi, causing skin diseases. But be careful not to take your dog to bask in the sun during the hottest times, as this can easily lead to heatstroke in your dog.