Then here are 29 posts to check: source:*tumblr* width:1280
I'll check the rest if is okay
I checked these 29, lpip deleted his wallpapers from tumblr and other wallpapers apparently were not modified

post #241854larger version

post #219891larger version

post #215948larger version (but the quality is bad, looks like a resizing with some program)

post #215171larger version (but the quality is bad too)

post #214452 (was deleted from tumblr)

post #214227larger version (but the quality is bad)

post #213856larger version (but the quality is bad)

post #213275larger version

post #213261larger version

post #212906larger version

post #207725larger version

post #207724larger version

post #1956028x5 pixels difference

post #131767 (I did not find on tumblr)

post #212907larger version
Was going to upload an image but after a moment looking at it, I really think something is odd with it.

What do you think about it?
The dog is in a really awkward position. It's like it's laying on its side and standing at the same time. (+ no shadow)
Yeah, it's definitely the dog.