"dogs look at your finger" --- this is only true of dogs that are thick or untrained. Ever met an assistance dog, a police dog or a military dog?
Even our dog understands pointing, "get that over there". etc. She understands that "hide" means go out of the room till I say "seek" and she understands "warmer" and "colder" when she's searching. Her expertise is food words -- she knows about 20 including "kitchen" and she knows that the tune "tasty, tasty, very very tasty" [Cockney Waiters] means that she's going to get some bran flakes.
My parents dog understood "seek [noun]" for about 30 items, including 5 people. he understood how to play cricket (sit at leg off, ignore ball when thrown by bowler, fetch - or try to catch -- ball if hit by batsman and return it to bowler). He understood "not that one, get the other one" whether it was remote controls or shoes. He understood that if you pointed at him and said "bang" he should roll over, groan and lie still.