The little guy looks just like my Sophie, she is from a yellow Lab Mom and a Corgie daddy. She does not have the docked tail but her face looks exactly like your puppy. Her color is about the same as well, she is now 14 months old and a great friend and wrestling buddy for 6 year old full chocolate Lab Ben. Ben was a neighborhood rescue in 2009 and he now is like a puppy with Sophie but still has lots of issues from his life before.
The last photo you posted of them looks like they had been having a fun time, lots of tongue and in need of a break. I am thinking Charlie votes for him to stay so he can have someone to play with.