Peanut was found a few weeks back running near a highway in rural Winnebago County.
"Eventually she let me pet her and let me pick her up and she was giving me kisses," Allie Reidl described. "Just a very affectionate dog."
Riedl and her mom took the dog to the Fox Valley Humane Association.
"She didn't have any tags or anything so we wanted to know what would happen to her because we wanted to take her in if nobody claimed her."
The shelter holds animals for seven days to see if an owner steps forward. When no one did, leaders told the family they could adopt Peanut if she passed some behavioral tests.
"Upon doing the temperament test, which is done by senior staff members, it was discovered that Peanut had severe food aggression," said Executive Director Liz Dietz.
Dietz said Peanut never bit anyone, but either snarled, barked, or postured during routine feedings. She said it was concerning enough that Peanut was put down.
"It's a very heavy decision to make, but we have to override that emotion that wants to save everything with the responsibility to the animal and the community that the reality is they really would be a threat in a home."
Riedl said she would have adopted Peanut anyway.
"I work at a doggy daycare in Greenville and we see things like that everyday," explained Riedl. "We work with dogs on their food aggression and it's a fairly easy behavioral thing to work with them to be able to fix. So to hear they put her down for something like that, that could have been worked on, was very heartbreaking."
Everyone involved agrees this is an unfortunate situation, but shelter leaders said some on social media are taking things too far. Dietz said some comments on the organization's Facebook page or mean-spirited and untrue.
"The problem with Facebook is that it's very easy for people to voice an opinion but not take responsibility. It's misinformation, not factual and, in fact, slanderous."
Riedl said she never meant for things to get out of hand, but said she won't support the shelter again unless something changes.
"My goal here is to change how they go about doing these things," she added.
Dietz said she stands by her decision and invites anyone with questions about their policy to call or stop by for more information.