My dog seems to know least the names of 6 family members, 4 friends, and names of ~6-7 other dogs (in that she can go to those individuals on command). She also knows: cat, dog, cow, horse, friend, hello, "dai lapu" (Russian for give me your paw), "sidi" (Russian for sit), sneak, "bang" (for playing dead), dinner, breakfast, bath, outside, "go potties", and probably quite a few other snippets of English.

She also knows how to open windows in a car and looks for the buttons before pressing them with her paw.