My little brother owns a hamster. But I own a puppy and my older brother owns a huge dog. Will they try to eat him if he is loose. My puppy has smelled him, but from in the cage. I don't want hamster blood in the dining room, ewww.

Its probibly fine, its cats you want to worry about,but just in case keep putting them together trough the cage.

I have 3 hamsters and a frog and my puppy does not even hurt it when i let Rover smell my hamsters, sometimes he licks him!!So i think you should hold the hamsterand let him know the smell of the hamster. but if he trys to bite it correct him.
from,
puppy-lover21095

P.S: I know because i owned a lot of hamsters and my dog did not hurt none of them.

what type of dog is he? this can make a big diffrence my chihuahua couldnt carless about my guinea pig but my rat terrier goes into KILL mode every time he sees them so be careful.