i can understand yr feeling coz my baby at around 2 months every morning when he wake up 抖氣時"hehe"聲.so i consult DR.he said the symtoms like nose sensitive.so i buy 空氣清新機 immediately.after that ,my baby got improvement.so may i suggest that u try 空氣清新機 for short period first,if no good result ,u can consider 搬去村屋住.anyway yr dog still young ,is easy to find another warm family .maybe better than 小狗住天台