The co-author of Trixie's Gettin' Back On Her Hooves, Godzillawolf, posted a side story based on this story, and is canon with this story.
After Winona has a run in with a skunk, Applejack does the natural thing and takes her to Fluttershy to be cleaned up. However, while taking care of the poor collie, Fluttershy realizes something; she doesn't know how Applejack got Winona in the first place. Curiosity gets the best of the timid pegasus and she asks. What she discovers not only reveals a lot about the little dog, but about Applejack as well.
Now curious as to what her other friend's pets mean to them, Fluttershy wonders about how Pinkie Pie and Rarity got their perfect companions as well.
I recommend it a lot.