Souraya,
I just read a similar post on a Golden Retriever board. A male dog who has started wetting his bed (3 times in 2 1/2 weeks). This happens often in females, I think, but you rarely hear about it with males. My bet would be that it is a urinary tract/bladder infection and you will get him straightened out in no time.
Hugs to Drake, and good luck at the vet's.
Logan