Is it okay for dogs not to bask in the sun?

It is not allowed for dogs not to bask in the sun. Whether they are large dogs or small dogs, they should be taken outside for a walk every day. If your dog cannot even see the sun, it is really unfair to it. It’s so bad for your health!
Let me give you the simplest example. What will happen if you don’t get sunlight every day? So do dogs!
Five-month-old dogs are still growing and cannot get sunlight, so they are prone to calcium deficiency, which can easily lead to deformation of their legs and back. There will be potential effects on its internal organs.
If white spots appear on your dog’s nose, it means your dog is in urgent need of sunshine!
I advise you to be kind to your dog! Under the same blue sky, it also has its own beautiful life!

If you let him bask in the sun now, you can at least avoid leg deformation. Moreover, it is not yet certain whether it has symptoms of leg deformation. I think this dog should not be that fragile, but he will not bask in the sun in the future. It's hard to say.
So, do it now! If possible, try to find time to take it out for a walk. This is the best thing for your pet’s health!
Also, pay attention to dietary nutrition. Feed it cooked pig bone sticks. Just cook them. Don’t cook them for too long. The dog will like to chew them. They are rich in bone glue and calcium. Calcium is very good for the dog's body, especially for dogs in the growth and development period. If possible, feed it more milk. Calcium is very important!
Also! Don’t feed it any bones, except chicken bones, which will hurt your dog’s stomach because chicken bones are too hard!
Pork or beef bones are fine!