Wow, did I just say that?
The Pixie Pets are companions of the pixies.
Pixie Pets have shiny wings like Pixies, they vary from 5cm to 10cm tall and are small creatures with heads that are generally larger in comparison to their body. Some Pixie Pets wear small accessories like bells and ribbons, they can also hide their pixie wings for diverse reasons.
Other than Concorda's Pixie Pets, the most common ones to appear as background characters are a Porcupine, a Bear, a Frog and a Bird. All of them showing their wings and generally flying and walking together.
The first Pixie Pet to make a debut was Concorda's Hippocampus, a light green seahorse with orange bright wings. On "The Shadow Phoenix" after Bloom follows him, she discovers Alfea's Secret Archives. Concorda explains to her that even though she is bonded to the Magic Archives she does not feel lonely because the Pixie Pets keep her company.