The call comes on what is National Black Dog Day.
Dogs Trust says black dogs looking for a forever home tend to be overlooked by potential new families in favour of different shades of fur.
The charity is marking "National Black Dog Day" which aims to show us the importance of not judging a potential pet pooch by its fur.
We need YOUR help to show the world how beautiful black dogs like Simpson & Oscar are! If you are lucky enough to own a black dog, we want to see their photo! #NationalBlackDogDay ? pic.twitter.com/geLYyhvatZ
— Dogs Trust Ireland (@DogsTrust_IE) October 1, 2019
It says you should try to find a four-legged friend who fits into your lifestyle, based on their personality instead of their appearance or coat colour.
The organisation has decided to mark the day by changing the pictures on its site of all the dogs who are waiting to be adopted, to black and white.
It is also asking people to share photos of their own black dogs using #NationalBlackDogDay to show people what wonderful pets they make.
Assistant manager of the Dogs Trust centre in Finglas in Dublin Eimear Cassidy is urging people to ignore how a dog looks:
"We find that the black dogs don't photograph as well so they don't stand out as much as the other brighter coloured dogs. People can walk past them and overlook them when they're in the kennels. They're still the most beautiful, loving dogs, they still have fantastic personalities. It doesn't affect their breed or how they behave - it's all just down to looks unfortunately."