You can domesticate a dog family, but their dinner is just the same (1975)

 Gaines, a division of General Foods at the time, experimented with not only having real dogs given human voices, but doing the same with costumed actors dressed as dogs, in the 70's.

Take, for example, this 1975 bit for Gravy Train with a husband & wife set of dogs. The wife's voice is that of actress Judy Graubart (The Electric Company). The husband could be Skip Hinnant (also from The Electric Company) or a slightly toned down Barry Gordon, I'm not sure which.