Darla, her family maintains, is an incredibly gentle cross between a shar-pei and a Staffordshire bull terrier.
"Darla has never bit, nipped or even growled at anyone or anything," Maddison's mother, Jenny Armer notes in a Facebook post. "Her nature is very soft and loving. She has been taken for the fact that she looks like a banned breed."
Lancashire Constabulary, the agency responsible for Darla's incarceration, did not immediately respond to The Dodo's requests for comment.
The Armer family's options are limited.
"They told me I could sign a disclaimer to have her put to sleep or I could fight the decision in the court," Jenny told the Mirror.
"I have to fight it because she is Maddison's best friend. She helps keep her calm. If Maddison is having problems, Darla comes and gets me."
After a period of observation and tests, authorities may also opt to put the 3-year-old dog on an exemption list.
A dog named Hank was given a similar reprieve last week, after he was seized from his family in Belfast, Northern Ireland - but not before an online petition garnered 300,000 signatures around the world.