Feline Leukemia and end of life decisions
5 months ago we brought an older kitten (estimated age 9-12 months) into our home. She was a rescue who was fully vaccinated. She is a thin cat. A few days ago, we noticed that she was acting strange (not playing, lethargic.) The next morning, she was breathing heavier than normal so I took her to the vet. Long story short, she was diagnosed with feline leukemia, fluid on the lungs, and anemia. The vet started her on clindamycin and lasik orally. She was mildly improved yesterday but is the same today as yesterday. She will not eat but will drink "cat" broth and lick the gravy off of wet food if we bring the food to her (which we are doing approximately every 2 hrs or so during the day time.) She uses the litterbox, and will occasionally purr or attempt to play for a very short time.
How do you know when it's time to euthanize? I don't want to euthanize if she's improving but I also don't want her to needlessly suffer.