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Can Cats Eat In-N-Out Milkshake? Dairy Dangers for Cats

Curious if your cat can enjoy an In-N-Out milkshake? Discover the dairy dangers for cats and why it's best to keep these treats off their menu!
Author: Veterinary Team
Dial A Vet
Updated
May 26, 2025
|
Published
May 26, 2025
Cat curiously eyeing an In-N-Out milkshake on a table, highlighting dairy dangers for feline health.

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As a cat parent, you’ve probably found your furry friend eyeing your food or drink at some point. If you’ve recently indulged in an In-N-Out milkshake and caught your cat sniffing around, you might wonder: can cats safely enjoy a sip of your sweet treat? While it’s tempting to share with your curious kitty, there are some serious reasons to think twice before offering dairy-based treats like milkshakes.

🍦 Why Milkshakes and Cats Don’t Mix

Milkshakes, including those from In-N-Out, may seem harmless, but they’re not suitable for your cat’s digestive system. Despite the stereotype of cats loving milk, most adult cats are lactose intolerant. This means their bodies struggle to digest dairy products, leading to unpleasant symptoms and potential health risks.

In addition to the lactose issue, milkshakes are loaded with sugar, artificial flavors, and other ingredients that can harm your feline friend. Even a small amount could upset your cat’s stomach or contribute to long-term health problems like obesity or diabetes.

🐱 Symptoms of Lactose Intolerance in Cats

If your cat consumes dairy products like a milkshake, you may notice some unpleasant symptoms within a few hours. Here’s what to watch for:

  • Diarrhea
  • Vomiting
  • Excessive gas or bloating
  • Abdominal discomfort or pain
  • Increased thirst due to dehydration from diarrhea

These symptoms occur because your cat’s digestive system lacks the enzyme lactase, which is necessary to break down lactose. Without this enzyme, undigested lactose ferments in the gut, causing gastrointestinal distress.

🍨 Other Ingredients in Milkshakes That Are Harmful to Cats

Beyond lactose, milkshakes contain several other ingredients that make them unsuitable for cats. Here’s why you should avoid sharing your In-N-Out milkshake with your feline friend:

  • Sugar: Cats cannot taste sweetness, and sugary foods offer no nutritional value. Excess sugar can lead to obesity, dental issues, and even diabetes in cats.
  • Artificial flavors: Many milkshakes contain artificial ingredients that can irritate your cat’s stomach or cause an allergic reaction.
  • Chocolate: If your milkshake is chocolate-flavored, it’s especially dangerous. Chocolate contains theobromine, a compound that is toxic to cats and can cause symptoms like rapid breathing, tremors, and seizures.
  • Whipped cream: While often added as a topping, whipped cream contains both lactose and sugar, making it a double threat to your cat’s health.

Even if your cat doesn’t show immediate symptoms after consuming a milkshake, the long-term effects of these ingredients can be harmful. It’s always better to err on the side of caution and keep sugary, dairy-based treats out of reach.

🐾 Healthier Treat Alternatives for Cats

If your cat is curious about your food, there are plenty of safe and healthy alternatives you can offer. Instead of milkshakes, try these feline-friendly treats:

  • Cat-specific treats: Look for treats formulated for cats, which are designed to meet their nutritional needs and are free of harmful ingredients.
  • Cooked meat: Offer small pieces of plain, cooked chicken, turkey, or fish as a tasty and safe snack.
  • Catnip: Many cats love the scent and taste of catnip, making it a fun and safe treat option.
  • Cat milk: If your cat loves dairy, opt for specially formulated lactose-free cat milk, which is safe for their digestion.

Always introduce new treats in moderation and monitor your cat for any adverse reactions. If you’re unsure about a specific food or treat, consult your veterinarian for advice.

🩺 What to Do if Your Cat Eats a Milkshake

If your cat manages to sneak a lick or two of your milkshake, don’t panic. A small amount is unlikely to cause severe harm, but you should keep an eye on them for any signs of discomfort. Here’s what to do:

  • Monitor their behavior: Watch for symptoms like diarrhea, vomiting, or lethargy.
  • Provide fresh water: Ensure your cat stays hydrated, especially if they experience diarrhea or vomiting.
  • Contact your vet: If your cat shows severe symptoms, such as persistent vomiting, diarrhea, or signs of chocolate toxicity, seek veterinary care immediately.

In most cases, your cat will recover on their own after a small amount of milkshake. However, it’s essential to prevent future incidents by keeping dairy-based treats out of reach and offering safe alternatives instead.

📋 FAQs

Can cats eat vanilla milkshakes?

No, cats should not eat vanilla milkshakes. While vanilla milkshakes may not contain toxic ingredients like chocolate, they still have lactose, sugar, and artificial flavors that can upset your cat’s stomach and harm their health.

Are small amounts of milk okay for cats?

In general, it’s best to avoid giving your cat milk. Most cats are lactose intolerant, and even small amounts of milk can cause digestive upset. If your cat enjoys dairy, opt for lactose-free cat milk instead.

What happens if my cat eats chocolate?

Chocolate is toxic to cats and can cause serious symptoms like vomiting, diarrhea, tremors, and seizures. If you suspect your cat has consumed chocolate, contact your vet immediately for advice.

Why do cats like milk if it’s bad for them?

Cats are often attracted to the fat content in milk, which is why they may seem interested in dairy products. However, their inability to digest lactose makes milk a poor choice for a treat.

Can kittens drink milk?

While kittens can digest their mother’s milk, they often lose the ability to process lactose as they grow older. Cow’s milk and other dairy products can still cause digestive upset, even in young cats.

References

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While every effort is made to ensure the accuracy of this content - including vet review where applicable - this article is for informational purposes only and is not a substitute for professional veterinary advice, diagnosis, or treatment. If your pet is unwell or you are concerned, please speak with a licensed veterinarian. You can book a $49 online consultation with our veterinary team  😄
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