Dog hair is a condiment around our house :)
Seriously, shedding is normal to a degree in most breeds. What breed of dog do you have and how old? What diet? Any patchy areas of hair loss? Any itching or scratching? Are your grooming and bathing him/her regularly, if so what do you use?
Once you have eliminated disease or medical conditions, dietary changes or supplements may be beneficial.
You are going to get a lot of personal experience advice and suggestions here, many probably will help. I'd suggest the next time you have a vet appointment, bring up the issue and get some suggestions.
Doug, DVM