Timid dog

If the dog is already almost a year old, I am going to tell you that you will be many long hours (many months) away from having a dog that you are able to take out in the real world and do anything with, if at all, just because you put the time in does not mean it will come out like you want.

Sometimes for some people the time spent with the "rescue" of the dog is well worth the personal satisfaction. I have had a few of those experiences in my lifetime of working with different critters, however many times after months of dissapointment and heartache its time to cut your losses, and if I was to get a Do-Over, I would have cut my losses alot earlier and gotten a dog that was going to be able to meet my expectations.

the saying "It costs the same to feed a good dog as it does a sorry dog" still holds true to alot of different scenarios and animals.
The Ultimate decision has to be yours, and yours alone. However if you do deide to cut your losses, be humane enough not to keep stressing this dog by passing into anothers hands.