It is not good for cats to bask in the sun through glass. Ultraviolet rays can be divided into UVA and UVB. UVB can promote the production of vitamin D in the skin, but it is blocked by glass. Therefore, basking in the sun through glass will not provide calcium supplementation. If you want to replenish calcium through sun exposure, just expose yourself to the sun for 10 minutes every day. Do not expose yourself to the sun through glass.

Precautions for cats basking in the sun:

1. Avoid the noon period. The sun's ultraviolet rays are the strongest at noon. Even if the cat has a layer of hair as a protective film, it cannot avoid the damage of ultraviolet rays to the cat's skin, which may easily cause the cat to suffer from skin diseases.

2. Avoid prolonged exposure to the sun. Cats basking in direct sunlight for a long time can easily lead to long-term exposure of the cat's eyes to the sun, resulting in vision impairment, tearing, etc. At the same time, it is easy to get sunburned, causing symptoms such as redness and pain on the skin.

3. Avoid vents. Cats basking in the sun in a ventilated place will not only easily catch colds, but also cause more dust to be carried in the cat's hair. When the cat licks its fur, the dust will involuntarily enter the body, which can easily cause gastrointestinal problems in the cat.