Thanks for your good advice. I have just a set of dehumidifier with air purifier function. Hong Kong weather is very humid nowadays and I hope this will help. We will also try to wash the dog more frequently.
I do not believe that the dog is the cause though, because Christy shows the same itchness reaction when she is brought to my home (where the dog is not kept)during weekends.
She is still showing itchness nowadays. I will just need to wait slowly. I have ordered the borage oil as suggested by you, waiting for the delivery from the US. She is still having serious cradle cap problem after using olive oil. Any suggestion?