"Why has this put a lump in my throat?" one person posted on Twitter.
"This has destroyed me," another Twitter user added.
Known for her love of corgis, the late monarch owned more than 30 over her lifetime, with each one descended from her first, Susan, an 18th birthday present from her father, George VI.
Her Majesty's corgis were often photographed near the Queen at various events.
Following her passing, the Queen's two surviving corgis have been left to Prince Andrew.