I Thought My Sister’s Cat Was Forced Vegan, So I Fed It Chicken. Now It’s Had an Allergic Reaction and She Wants Me to Pay.
We all know that when you agree to do a favor for someone, especially when it involves caring for a beloved pet, you follow the instructions you are given. It’s a simple matter of trust and respect. After all, the owner knows their pet best.
However, one woman recently took to the internet to share a story that proves not everyone abides by this fundamental rule, leading to a family feud and a trip to the emergency vet.
The Incident
A woman, who admitted she was “broke,” convinced her sister to let her pet-sit instead of sending her cat, Mimi, to a “fancy pet hotel” during a business trip. From the start, her post was dripping with disdain for her sibling, calling her a “crazy cat lady” who doesn’t have a “man or kids” and is an outspoken vegan.
While staying at her sister’s home, she decided to inspect the cat’s food. When she read the ingredients and saw no obvious signs of meat, she made a snap judgment. “I figured this was her taking a vegan stance and decided that enough was enough,” she wrote. She proceeded to give the cat some of her own cooked chicken, and when the cat enjoyed it, she bought more and fed it to her all week.

Her sister returned home and called her, absolutely hysterical. The cat, Mimi, was having a severe allergic reaction to the chicken and had scratched herself to the point of needing veterinary care. The pet-sitter’s defense? She didn’t know cats could be allergic to chicken, and she felt it was her sister’s fault for not telling her. Now, her sister wants her to pay the vet bills, but she feels she shouldn’t be punished for a “mostly harmless mistake.”
The Internet Reacts
The online community was swift and decisive in its judgment, with readers splitting into a few distinct camps.
The first and largest group was the “Absolutely Not” Crowd. These readers were furious on behalf of the cat owner, arguing that the pet-sitter’s actions were inexcusable. One commenter perfectly captured the sentiment: “You never, EVER give an animal you’re pet-sitting food that hasn’t been approved by the owner.”
Another pointed out the sheer audacity of the situation, noting, “She was trying to do you a favor against better initial judgement… It wasn’t her ‘taking a vegan stance’, it was YOU making an incorrect assumption.”
A much smaller group tried to play Devil’s Advocate, suggesting the sister shared some blame for not explicitly warning against feeding the cat chicken. One person wrote, “Doesn’t help she didn’t tell you, however.”
But this view was quickly shut down by others who argued that no one should have to provide a list of things not to do when they’ve already provided clear instructions on what to do. As one person put it, “She had zero reason to expect the cat to be fed anything other than what was provided.”

Finally, there was the “Expert Opinion” Crowd, who dismantled the pet-sitter’s entire premise. Many pointed out that chicken is one of the most common food allergens for cats. More importantly, they explained that the cat food likely wasn’t “vegan” at all, but a special prescription diet.
“I’d guess this was an anallergenic cat food with hydrolyzed protein to reduce allergen exposure, and OP just didn’t recognise that as meat,” one insightful user commented. This theory suggests the sister wasn’t imposing an ideology, but was being a responsible, caring pet owner.
The Etiquette Verdict
Let’s be perfectly clear: the pet-sitter is entirely in the wrong. This isn’t a simple mistake; it’s a staggering breach of trust rooted in judgment and disrespect for her sister. When you agree to care for a pet, you become a steward of its health and well-being.
Your job is to follow the owner’s rules to the letter, not to impose your own beliefs or conduct culinary experiments. The fact that her actions caused the animal to suffer makes it even more egregious. She should absolutely pay the vet bills and offer a sincere, heartfelt apology.

Your Thoughts
Was the pet-sitter’s mistake forgivable, or was this a deliberate act of disrespect that should sever the sisters’ trust for good?
