Wendy Maddocks said Elmo had brought home at least 14 gloves from neighboring gardens in Belper, Derbyshire, the UK, over the past year, BBC reported.
She said the three-year-old usually brought home one glove and went back to fetch the matching hand later.
Maddocks has been trying to reunite the gloves with their owners through a community Facebook page.
"He meows really loudly when he comes in with them in his mouth," she said.
"He drops them at my feet and looks at me, really proud."
Following her Facebook appeal, one neighbor spotted their gloves but said Elmo was welcome to keep them for his collection.