Can a person demand return of a gift

I must confess I don't like cats anyway, but I've never heard of bread cat. Cats are sly.
Once I had to repair my neighbours window, which I accidentally broke. The next day my neighbour told me that some of the glazing putty had been removed....probably by birds.
I repaired it again. Next day, same thing.
After repairing it again I decided to keep it under observation. It wasn't birds.....A cat came slinking down the wall and sidled up to the window and began to scape out the putty.
One of those rare breed cats I think... the one without a tail, whatever they're called
 

Putty Go Lore. The notorious cat burglar.
 
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Why do I need to prove ownership?
From the original post, its not clear, but I assume:

Boy meets girl
Boy moves in with girl
Boy buys girl a cat as they are both cat lovers
They break up
Boy moves out
Boy wants his cat back
Girl says its her cat, not his
Girl posts on AAM
 
Fair enough, but it still leaves my question to you unanswered - "Why do I need to prove ownership?" - of the cat or anything else. In post 2 I've already answered the question posed by OP, pretty emphatically
 
From the original post, its not clear, but I assume:

...
Boy moves out
...
Nope: