How long does a dog remember his previous owner?

I recently moved overseas and had to leave my 3year old golden retriever, the next time i would be going back would be in a full year, would my dog still remember me?

Yes, still he'll remember you.

forever

Yes of course he'll recognize your scent and then recognize you

I got my terrier at 6 weeks old, and he remembers the breeder even when its been a couple years in between visits. Golden retrievers are known to be smart also.

Scent is related to memory in a very strong and long-lived way, even in humans. Also, dogs can be really good at picking out voices.I will say this though. My dog couldn't recognize his own brother from the litter, but then they were separated at a far younger age (I think like 3 mo. of age).