I have a 14.5 y/o lab...   from time to time I have to help him get up... but with some good effort he can get up on his own.  Sometimes he lays on his mat too long and when he dose get up to go out side he don't make it and leaves a mess to be cleaned up.

He can't really see past his nose much any more and his hearing is shot... And for the most part... he is so skinny... nothing but skin and bones. 

He still eats ...  still likes to get his petting... 

How do you know when it is time to take him in for the shot ?