I am so sorry for you and your Tulip. As far as quality of life I'm sure she will let you know when it's time. As far as our quality of life with our boy sure maybe it was a hassle having to lift him up and help him walk, or maybe it was a little more of a hassle and more expensive to buy and cook him meals. But as long as he was eating and wagging his tail we kept him alive and loved him! We knew it was time when he refused to eat a piece of pizza and his eyes told us he was tired then we knew.