I'm not sure of a specific one titled exactly like that, but there might be some on fanfiction.net. You can search for tags like 'Sirius Black' and 'dog house' to find relevant stories. Usually, stories that explore Sirius's time as a dog and his connection to a particular place like a dog house can be really engaging.
One interesting fanfiction could be where Sirius Black uses the dog house as a secret hiding place from the Ministry. He might transform into his dog form and stay there when he feels threatened. Another could involve him reminiscing about his time as a dog while sitting near the dog house at Grimmauld Place.
One great Sirius Black dog fanfiction is 'The Padfoot Chronicles'. It delves deep into Sirius's time as Padfoot, his relationship with the Marauders during those moments, and how his animagus form affected his experiences. Another is 'Padfoot's Redemption' which focuses on Sirius trying to make up for lost time after his long imprisonment.
A really good one is 'In the Company of Padfoot'. It tells the story of Sirius's time as a dog and how his friendships are not only maintained but also enhanced. For example, he has a special friendship with a young wizard who is an outcast, and together they learn a lot about acceptance and loyalty. The story does a great job of highlighting the importance of friendship in Sirius's life, both in his human and dog forms.
Well, in these fanfictions, we see a more vulnerable side of Sirius. For example, in many of them, his time in Azkaban is explored in greater detail. We get to understand the true extent of the psychological damage it caused him, which makes his character more three - dimensional.
Remus Lupin is often present. He was one of Sirius' old friends and a fellow Marauder. Their friendship can be delved into deeper, especially considering the complex history between them. Dumbledore is another common character. He plays an important role in the wizarding world and his interactions with Sirius can add depth to the story.
One possible fanfiction could be about Sirius Black being in a situation where he has to face Voldemort alone. Maybe he discovers a secret weakness of Voldemort that no one else knows. Sirius, with his brave and reckless nature, decides to take advantage of this knowledge to try and take down the Dark Lord once and for all.
A fanfiction could center around Sirius Black's attempts to rescue someone from Voldemort's clutches. He uses his skills as an Animagus and his knowledge of the wizarding world's hidden paths to get close to Voldemort's lair.
Well, Sirius Black's scars in fanfiction can vary a lot. Some fanfictions might focus on the emotional scars that are not as visible but are just as deep. His scars could be used to show his connection to other characters too. Maybe a scar he has is linked to a shared experience with Remus Lupin, which then builds on their friendship in the story.
For a more angsty read, there's 'Sirius' Forbidden Love'. It deals with the difficulties of Sirius being in a gay relationship in the wizarding world. It shows the internal struggles he faces, as well as the external pressures, and how love still manages to find a way through all that.