Help me up harness!

Hi! I have this awesome Black lab for over 12 years! But he has one problem....Trouble getting up and around due to arthritis so to help him i wanna try and raise enough to get a help me up harness for this amazing wonderful dog! He has been a amazing partner in my life. He can walk but his balance is so bad for his age that i wanna add that extra help to get him around better.