What i suppose to do, if i luv my dog but its fur are often falling,and i afraid i will get asthma by it?

you wont develop asthma, your dog may just need brushing more, some dogs shed more fur in the summer. Anyway asthma can be treated cant it?

If you haven't got asthma by now you are unlikely to. Just being around dogs can upset asthmatics. You need to groom it regularly so the old fur underneath comes out and your dog has a shiny coat. There are plenty of brushes and combs now for grooming. Do it outside if you can as it does fly about...depending on the breed. I groom mine mostly in the evening while watching TV and don't even notice I'm doing it until I have a lot. Good luck, Cathy

You won't develop asthma because your dogs hair is falling out. Most breeds of dog shed their coats. Brush your dog regularly, do not over bathe him (this will dry out his skin), and give your dog a good high quality food. It doesn't have to be expensive food, it just has to be healthy for dogs. I buy mine at a local feed lot. I suggest you do some research on the internet about the causes and effects of asthma ... it is very interesting.

First of all - what kind of dog is it? You should take it to a groomer!!!

take it to a groomer.