4 Year old Male Retriever/Lab (Moses Lake)

We are sad to be rehoming our 4 year old golden retriever lab mix.
He is great with kids (we have three young ones 5-10), has been around cats (though he likes to play a bit aggressively with them) and has also been around chickens.
He is house trained, and loves to play fetch.
He wants to be near his people and loves to be at your feet.
He's a good guard dog and really pays attention to what is going on.
The only time he was ever aggressive towards a person was the vet, he does not like the vet.
The reason we are rehoming him is because I have gone back to work outside of the home and he is now alone most of the time.
He doesn't misbehave when we are gone, but he is not as happy and we aren't able to give him as much exercise as he should have.
Asking a $50 rehoming fee.