As dog trainers we know just how curious and energetic dogs can be. Their keen noses and love for foraging make them particularly prone to sniffing out—and sometimes eating—things they shouldn’t. A common concern from owners is, “How do I stop my dog eating something dangerous?” Understanding what’s toxic to dogs and how to prevent them from ingesting harmful substances is key to keeping them safe.

Common Toxic Foods and Substances for Dogs
There are many everyday foods and plants that are toxic to dogs. While spaniels in particular are quick to scavenge, any breed can be at risk. Here are some of the most common dangers:
Foods That Are Poisonous to Dogs
- Chocolate – Contains theobromine, which can cause vomiting, diarrhoea, seizures, and even be fatal. Dark chocolate is the most dangerous.
- Grapes and Raisins – Even small amounts can cause kidney failure.
- Onions and Garlic – Damage red blood cells and can lead to anaemia.
- Xylitol (Artificial Sweetener also known as birch sugar) – Found in sugar-free gum, sweets, and some peanut butters. It can cause a dangerous drop in blood sugar and liver failure.
- Avocado – Contains persin, which can cause vomiting and diarrhoea.
- Alcohol and Caffeine – Both can lead to heart problems, tremors, and seizures.
Poisonous Plants and Outdoor Dangers
- Daffodils, Tulips, and Bluebells – Common in spring, these flowers can cause vomiting, diarrhoea, and lethargy if eaten.
- Acorns and Conkers – These can cause stomach upset, blockages, or even be toxic in large amounts.
- Fungi and Wild Mushrooms – Some can be highly toxic and cause neurological issues.
- Slug Pellets and Pesticides – Many contain metaldehyde, which is fatal if ingested.

Household Dangers
- Rodent Poison – If ingested, rat poison can cause internal bleeding and be fatal.
- Medications – Many human medications, including ibuprofen and paracetamol, are highly toxic to dogs.
- Cleaning Products – Bleach, disinfectants, and antifreeze are all extremely dangerous.
How to Stop My Dog Eating Something Toxic
Training and Prevention
- Teach “Leave It” and “Drop” Commands
Training your dog to respond to a solid “leave it” command can prevent them from picking up harmful items in the first place. If they do get hold of something, “drop” ensures they let go before swallowing it. - Manage Their Environment
Keep harmful foods and cleaning products out of reach. When out on walks, be mindful of what’s on the ground—especially if you’re near woodland, picnic areas, or in the garden. - Use a Lead When Necessary
If your dog has a habit of scavenging, keeping them on a lead in high-risk areas will stop them from picking up anything dangerous before you can react. - Supervise in the Garden
Check your garden for poisonous plants, fallen fruit, or anything else your dog could eat. - For persistent scavengers professional training may be required
If your dog is particularly determined to scavenge, we can help put a training plan in place to help protect your dog.
What to Do If Your Dog Eats Something Toxic
If you suspect your dog has eaten something poisonous, contact your vet immediately. Symptoms of poisoning can vary but often include vomiting, diarrhoea, drooling, lethargy, tremors, and seizures. The quicker you act, the better the chances of a full recovery.
Emergency Steps
- Call your vet and provide details of what was eaten, how much, and when.
- Do not try to make your dog vomit unless specifically instructed by a vet. Some substances can cause more harm if brought back up.
- Keep any packaging or samples of the substance to help your vet determine the best treatment.

Final Thoughts
Spaniels and other high-energy breeds love to explore the world with their noses and mouths, which makes them more prone to eating things they shouldn’t. Training, supervision, and understanding common dangers can go a long way in keeping them safe.
If you want help training your dog to stop eating things they shouldn’t, get in touch! We offer specialist training tailored to your dogs needs, helping you build reliable commands and safe habits for worry-free adventures.
📩 Contact us today to book a training session and keep your dog safe from harm.
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