Valentine’s Day brings chocolate, sugar-free sweets, drinks and flowers into the house, often left on a table or a low shelf in their gift wrap, and a dog or puppy who finds them can be seriously poisoned — so the simplest gift you can give your dog is to put every box, bag and bouquet out of reach and to know what to do if something goes missing.
The most important first
- Chocolate is toxic to dogs. The darker it is, the more dangerous: cocoa powder and baking chocolate are the worst.
- Sugar-free sweets, gum and baking may contain xylitol, which can cause a dangerous drop in blood sugar within an hour, and later liver damage.
- Keep drinks out of reach. Alcohol is absorbed quickly and even small amounts can harm a dog.
- If your dog eats any of these, call your veterinarian or a pet poison helpline at once. Do not wait for signs.
Last updated: November 8, 2026
Chocolate
Chocolate contains theobromine and caffeine, which dogs process slowly. The Merck Veterinary Manual explains that cocoa powder has the highest concentration of these compounds, followed by unsweetened baking chocolate, while milk chocolate has much less and white chocolate very little — but a small dog can still be seriously affected by milk chocolate. Signs usually appear 6 to 12 hours after eating and start with vomiting, diarrhea, thirst and restlessness; they can progress to tremors, seizures and abnormal heart rhythms.
Holidays are a known risk. In a study of veterinary records from practices in the UK, Noble and colleagues found a heightened risk of dogs eating chocolate around Christmas and Easter, when chocolate is everywhere in the home. Valentine’s Day follows the same pattern: boxes of chocolates are given as gifts, opened and left out.
What helps: keep chocolate in a closed cupboard, not on a coffee table, nightstand or in a handbag on the floor. Tell guests and children, and ask them not to share.
Xylitol in sugar-free sweets
Xylitol is a sweetener used in sugar-free gum, mints, candy and chocolate, some baked goods and desserts, toothpaste and some peanut butters. According to the US Food and Drug Administration, in dogs it can cause a sudden drop in blood sugar within 10 to 60 minutes, with vomiting, weakness, staggering, collapse and seizures. Other serious effects may not appear for 12 to 24 hours, which is why a dog may need hospital monitoring even if it seems fine at first. The ASPCA notes that liver damage can occur within 12 to 24 hours. A 2025 study by Lovell and colleagues of 95 dogs treated after eating xylitol looked specifically at which dogs went on to develop liver injury, a reminder that this is a recognized complication and not a rare curiosity.
What helps: read labels on sugar-free products, keep gum and mints out of coats and bags at dog height, and use only dog toothpaste on your dog.
Alcohol, raisins and other treats
- Alcohol. The ASPCA warns that alcohol is rapidly absorbed and can cause vomiting, diarrhea, loss of coordination, breathing problems and, in severe cases, coma. Keep glasses and open bottles off low tables, and clear them away after a party.
- Grapes and raisins, including raisins in baking and chocolate-covered raisins, can cause kidney damage in dogs; the ASPCA lists tartaric acid as the suspected toxin.
- Raw yeast dough for homemade bread or pizza can expand in the stomach and produce alcohol.
- Rich leftovers from a special dinner, such as fatty meat, bones and buttery sauces, can upset a dog’s stomach and are worth keeping out of the bin your dog can reach.
Flowers and wrapping
The ASPCA points out that all species of lily are potentially fatal to cats, so if you share your home with a cat, lilies should not be in the bouquet at all. For dogs, thorny rose stems can injure a mouth or paws, and many plants and flowers can upset the stomach if chewed. Ribbon, cellophane, foil and string are a choking and blockage risk, especially for puppies; see puppies and swallowed objects.
In practice
A couple come home from dinner to find their year-old Labrador next to a torn box of chocolates and an empty pack of sugar-free mints from a coat pocket. They photograph the boxes, estimate how much is missing, and phone the emergency clinic, which asks for the dog’s weight and the type of chocolate and tells them to come in at once because of the mints. The dog is treated and goes home the next day.
(Illustrative, composite scenario.)
If your dog eats something
- Move the dog away from what’s left and keep the packaging.
- Work out what, how much and when. Note your dog’s weight.
- Call your veterinarian, an emergency clinic or a pet poison helpline straight away. Don’t make your dog vomit unless a veterinarian tells you to.
- Follow their advice even if your dog seems well. With xylitol and chocolate, signs can be delayed.
When to call your veterinarian
- Your dog has eaten chocolate, sugar-free sweets or gum, raisins, raw dough or alcohol, even if it seems fine.
- Vomiting, weakness, staggering, trembling, restlessness or a racing heart after a holiday treat.
- Collapse or a seizure: this is an emergency.
- If in doubt, call — your vet would rather hear from you early.
Work on it
A few minutes here will teach you more than re-reading the article.
Ask yourself
- Where in my home could a dog reach a box of chocolates?
- Do I know which products in my house contain xylitol?
- Do I have my emergency clinic’s number saved?
Find out & check
- Read the labels on your sugar-free gum, mints and peanut butter.
Do one thing
- Save your veterinarian’s, your nearest emergency clinic’s and a pet poison helpline’s numbers in your phone today.
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Sources & further reading
- US Food and Drug Administration — Paws Off Xylitol; It’s Dangerous for Dogs. fda.gov
- Merck Veterinary Manual — Chocolate Toxicosis in Animals. merckvetmanual.com
- ASPCA Animal Poison Control — People Foods to Avoid Feeding Your Pets. aspca.org
- ASPCA (2023) — Have a Happy and Pet-Safe Valentine’s Day with These 3 Tips! aspca.org
- Noble PM, Newman J, Wyatt AM, Radford AD, Jones PH (2017) — Heightened risk of canine chocolate exposure at Christmas and Easter. Veterinary Record 181(25):684. doi.org
- Lovell T, Peterson K, Kundu D, Mochel JP, Walton RAL (2025) — Retrospective evaluation of the incidence and risk factors associated with the development of a hepatopathy in xylitol ingestion: 95 dogs (2018–2022). Journal of Veterinary Emergency and Critical Care 35:571–576. doi.org
Where evidence is limited, recommendations rest on established practice and expert judgment, and may be updated as knowledge develops. This is general information and does not replace advice from your veterinarian.
Next steps
- Read next: Poisoning risks in the kennel and home.
- Related: Puppy warning signs: when to call the vet · Puppies and swallowed objects.
- Return to the guide: Breeder’s Library.