Hangdog doesn't quite do justice to the mournful expression that seems to have put off potential owners from adopting Rottweiler-cross Bless.
The six-year-old has been waiting for someone to take her in for five months - making her the longest staying resident at Battersea Dogs and Cats Home in south London.
And staff believe the lack of interest may be because of the doleful dog's permanently sad expression.
Rob Young, head of dog rehoming at Battersea, said: "Bless has a mournful face but a heart of gold - anyone who meets her can't believe what a gentle giant she is.
" Although she looks sad, she is an absolute joy to be around - that's why it's so sad for us that she's still in kennels rather than happily established in a loving home."
Bless was found on the streets of London as a stray.
She is described on the home's website as a "mature lady who enjoys the simple things in life" and a "steady, easygoing character who takes the world in her stride".