Belgian Tervurens

I am going to buy a Terv that a breeder is willing to sell me a male , i did the survey and have talked to the breeder my problem is i have doupts on my abilty to have this dog my research shows me they need alot of attention and time the dog would have to spend 8 hours in a outdoor kennel with garage acces while i work days i also have a yorkie that has a attitude and a poodle terrier mix that is about 25 lbhow would a Terv be in this enviroment my wife and i have no children and live on a acreage i would try to set up a agilty course to exercise him and plan to walk him on a neaby bike path for excersise and social time would like to try thearpy work such as nursing home etc. ZMy wife and i have had dogs for 27 years and would like to here some input on owning one of these beutiful dogs we have to decide soon and want to make the right decision thanks. mitty