I went through this during Feb. of this year with my GSP Gracie,she was almost sixteen years old !
I am going to be blantantly honest with you,if you are questioning it,it is time.
I was selfish by keeping Gracie as long as I did,I should of put her down a month or two before I did.
I had it in my head since she was eating something,and still getting around even though she was falling a lot due to a light stroke,she was worth keeping alive,now I regret it as she was simply living for me.
I dont mean to come across as harsh or uncaring as I am the worlds biggest softy when it comes to dogs.
if you want to read how I felt about her,you can read my tribute to her here on IDO,it is in the hunting forum under hunting dogs titled,Gracie,Iowaboys GSP 9-03-2-19
my heart goes out to you,it is a damn tough decision to make,and a damn shame they cant live as long as we do.