Guys, what does it mean when a guy you've been on a second date with keeps the photo of your dog?

I was NOT expecting him to actually keep that picture when I asked him to take it and when I asked him for it I just said if he still had it to please send it and he still had it!

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I was expecting him to delete it since it was just a second date haha
Guys, what does it mean when a guy you've been on a second date with keeps the photo of your dog?
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