Found dog-looking for home

Found this young male pup roaming my street looking for food and water a few weeks ago. Had a collar but no tags nor microchipped so difficult to track owner down. As days go by, it is more likely he was a dumped dog. Sad, as he is a great dog, sweet, cuddly and always want to be with humans. I unfortunately cannot keep him as I already have a large dog and my dog is not to fond of sharing the house. Called many shelters but all are full and local rescues are struggling as well. Looking to see if this community knows of groups who can help foster or maybe know someone who wants a dog to add to their family. He is a mix of a German shepherd and Labrador it looks like, prob about 8 months old.