- “Mind as well milk it!”
- ―Raven Baxter
"Don't Have a Cow" is the second episode of the second season of That's So Raven.
At Bayside High, Eddie reveals to his friends that he was invited to Alana's party. Raven and Chelsea were not invited due to Raven's past grudges with Alana. After school, the two go to the Chill Grill where they find out that Victor allowed Alana to have the party at the Grill (which Raven believes Alana did to spite her). After they start eating their food, Chelsea freaks out when she realizes her and Raven's meals were switched. She's ashamed of accidentally eating a hamburger since she's a vegetarian.
At Raven's house, Chelsea starts wearing a button with a cow's face on it, still mortified by her actions. Raven suggests they look into Aunt Viv's chest for old magical artifacts, and they discover a spell book containing a spell that can grant wishes. After gathering up the ingredients and placing them in a cauldron, they cast the spell and wish to go to Alana's party. Raven then receives a call from a hypnotized Alana confirming that she and Chelsea can come to the party. They then use the spell to wish they were the most popular girls at the party and win the costume contest, and in their excitement fail to notice that Chelsea's button fell into the cauldron.
While preparing their costumes, Chelsea notices that Raven's ears are long and pointy like a cow's, mistaking it for a costume part. They start freaking out when it turns out it's Raven's actual ears and are further frightened to find that Chelsea has a long white tail on her backside. After they both get cow ears and tails, Eddie arrives at the house and they cover up their heads and stand next to each other to avoid Eddie seeing their new body parts. They force Eddie out of the house with the book as Raven starts mooing in a low pitched voice. They find the button in the cauldron and realize the button's interference is turning them into cows. With Eddie having the spell book, they decide to go to Alana's party to get it back and and reverse the spell, figuring no one's going to question their appearance since it's Halloween.
Raven and Chelsea arrive at the party only to find they now have snouts. As the night goes on, the spell continues changing Raven and Chelsea into cows by altering their body parts (such as turning their hands into hooves and giving them larger tongues) and affecting their behavior (making them eat, drink, and moo like cows). They find Eddie, but Chelsea ends up eating the page with the instructions to reverse the curse. Alana's friends announce the winners of the contest and are surprised to find Alana in second. Alana angrily runs up and discovers Raven and Chelsea won. At this point, the two are completely transformed into cows and decide to "milk" the moment. It's then revealed that the whole episode was a vision, and Raven stops Chelsea from eating the burger, preventing the whole thing from ever happening.
In the side plot, Cory (who's dressed as a weightlifter) decides that he wants to trick or treat with his friend William (who's dressed as a remote), disappointing Victor (who's Dr. Frankenstein). Tanya (dressed as Mrs. Frankenstein) suggests that she and Victor go trick or treating on their own. Cory and William end up missing out due to Will's costume setting off alarms in the neighborhood while his parents get bagfuls of candy. Feeling guilty, Cory admits to Victor that he misses trick-or-treating with him, and the two and William go back out to get the candy that Cory and William missed out on (provided William doesn't touch his suit).
- This is the first time that one of Raven's visions took up most of the episode, making her plotline more event-less as she prevented the vision. It's unknown what would've happened to Raven and Chelsea in the vision after they turned into cows and if the transformation was permanent.
- Unlike most episodes, which are centered on reality, this episode is a foray into fantasy and shows the potential magical properties the world of That's so Raven has (wishes, hypnosis, and animal transformations) outside of Raven's visions.
- The title is based on Bart Simpson's catchphrase "Don't have a cow, man".
- Raven and Chelsea turning into cows is a possible homage to Lampwick's donkey transformation in Pinocchio. The order in which they transformed into their respective animal was nearly the same.
- Both scenarios also ended with uncertain outcomes. They ended with the characters fully transformed into their respective animal after losing their clothes and ability to speak. The only difference was that Raven and Chelsea's cow transformations were prevented thanks to it happening in a vision.
- Raven and Chelsea are the only female Disney characters to be turned into cows, as the others are Dave Barbarian and Heinz Doofenshmirtz. However the terminology makes sense with Raven and Chelsea as cows are female cattle, while male cattle are bulls (though Raven and Chelsea would be classified as heifers as neither has given birth to a calf yet).
- Strangely enough, both Dave and Heinz had prominent udders when they transformed, while Raven and Chelsea's were not fully grown. Male cattle cannot grow udders, but female cattle can.