What's so offensive about two men and a dog?

I want to show you something. It's a picture of two men and a dog:


According to Canadian media outlets, this image sparked online outrage from the homophobic public.

What's the deal?

The picture depicts Scott Brison, a member of Canadian Parliament, alongside his husband Maxime and their dog Simba. Like many politicians, Brison sent this image of his family out as his Christmas card.

"The overwhelming response has been very positive," said Brison, an out gay Liberal MP from Nova Scotia. "There'...