Three long-in-the-can CBS series — including the perennial “when’s it going to air?” animated series “Family Dog”– finally have timeslots on CBS for this summer.“Family Dog,” the twice-reworked series from Steven Spielberg and Tim Burton as well as producer Dennis Klein, will finally be unleashed with two half-hour episodes from 8-9 p.m. June 23 and will continue in the lead-off slot on four successive Wednesdays. “Cutters,” starring Robert Hays and set in a barber shop, will air at 8:30 p.m. Fridays beginning June 11, while “Johnny Bago”– an action/comedy hour starring Peter Dobson — will go at 10 p.m. Fridays as of June 11. Exec producers on “Johnny Bago” include filmmakers Robert Zemeckis, Frank Marshall, Jeffrey Price and Peter Seaman as well as Papazian-Hirsch Entertainment, while “Cutters” is from Turnaround Prods. and Grant/Tribune Prods. CBS officials have long joked in regard to the whereabouts of the on-again, off-again “Family Dog,” which was ordered in early 1991 but delayed when Burton and Spielberg, upset by the quality of the animation, junked initial episodes.