that depends on the endings you have already, try to go through and find any choices that you didn't click! after you are positive that you've done that, the "..." choice to feed the cat when it's still in the alleyway should say something else that you are able to click!
Some options have branching endings attached to them. Most of the endings you get from not taking the cat home. Make sure to click on all starting options more than once and do every variation of options that they give you.
