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Anna Parker, from Canada, roped in the help of her husband Brett and their five-year-old daughter, Ivy Lux, to transform the space for their nine-month-old Bernese Mountain Dog and Australian Shepherd cross, River.
The idea came about when the family were renovating their basement. Brett thought it would be a good idea to knock into the wall so the 5st 7lbs puppy could have his own space.
But Anna wanted to add her own touch, so decided to create a mini version of their own house to make the space more cosy, adding the same house number and decorating the inside with wallpaper and laminate flooring.
She even added photographs for an extra homely feel!
"I wanted to make it look cosy and inviting and not just a hole in the wall," said Anna.
"Before this it was an unfurnished storage closet. It's in the style of our own house and the plans we have for the exterior. It has the very same numbers of our actual address and the same light outside.
"The only thing that is slightly different is the colour but we are planning to repaint the front of the house anyway.
"I think the people that know us really well aren't surprised that we took on such an elaborate project but the people that don't know us have been really impressed."
Anna and Brett welcomed River into their family after sadly losing their son, Joplin, five, in January last year to a rare genetic mutation called the HECW2 mutation, which causes neurological degeneration.
Since then, River and Ivy Lux have become best mates - and they even had a sleepover in River's new pad on the first night.
And the whole project was mega cheap too, with Anna only spending £80 on extra wood and £20 on a door handle, having already had leftover materials from previous home renovations.
"I never expected it to go so viral but the reaction has been amazing and I have got a bit of a kick out of all of the women tagging their husbands in the post," she said.
"As soon as Brett suggested cutting a hole in the wall to the storage room I said 'if we're going to do this we are going to do it properly'.
"Ivy Lux was so excited when we told her what we were doing, she couldn't wait to get involved and help.
"Since she lost her brother, River has been an amazing support. The two of them are best friends, they do everything together, so it made sense that they spent River's first night in there together.
"They both loved it!"
This really is the cutest idea, River is one lucky pup!
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