I am glad to hear you were here to help that beautiful puppy!!
Our dog wandered on to our property just a month or so after we moved here-covered with fleas and so exhausted he wouldn't even walk-so we carted him in and gave him a bath and a home and he's such a smart, sweet and loving dog...turns out he came from next door, and he just wandered off. We live in a rural area, and the people next door had lots of dogs-and got in trouble for letting them run lose. Some of their dogs died.
I'm glad we got Max (he's a golden retriever, too-maybe mixed) because I am almost sure he'd be dead now otherwise.
You're very sweet to help this puppy out!