Explain this saying “You cannot win someone else's race”.

So, basiclly, its saying that if someone like a friend or family etc; has something going on, like a law accusation or sum, you can try to help, but you cant do it for them.    

you see what im sayin? i know what it means but like, i cant explain it very well, hope this helpppsss!

i would just say something like,

i need to go outside owner to pee, hold on owner let me mark this tree. i'm thirsty now "starts drinking water" now i am tired. what are you eating owner can i have some, you can't refuse my cute puppy eyes.

just make sure you write that in your own words that way you don't get in trouble.