Dog Chewing Christmas Tree Lights: How to Stop

A dog that bites through a live cord can suffer an electric shock or burns to the lips, tongue, and the roof of the mouth. In some cases fluid can build up in the lungs hours later. Even when the lights are off, chewing can break bulbs or expose wire, and swallowed fragments of glass, plastic, and metal can cause injury or blockage.

Low-voltage LED lights are generally less hazardous than older mains-powered strings, but there is still a risk from the plug and any transformer, and from swallowed pieces. Treat all cords as a hazard for a chewing dog.

Safety first: turn off the power at the wall or the breaker before you touch your dog or the cord. Do not grab a dog that may still be in contact with a live cord.

1. Switch off the power, then unplug the lights.
2. Check your dog's mouth for burns, redness, blisters, or bleeding, as far as your dog allows.
3. Look for swallowed bulb pieces, and keep any broken parts you find.
4. Call your veterinarian straight away, even if your dog seems fine.
5. Follow their advice, which may include an examination and monitoring for breathing problems.

Note: Signs such as coughing, labored breathing, drooling, a reluctance to eat, or collapse need emergency care. Do not wait for them to get worse.

A few simple changes remove most of the risk. Think of it as making the lights inaccessible and uninteresting at the same time.

• Use cord covers or split loom tubing designed to protect cables, or run them along walls and behind furniture.
• Keep the lowest branches free of lights and the bottom of the tree away from the dog.
• Use a pen or gate around the tree if your dog cannot be supervised.
• Choose lights with a timer, and unplug them when you leave the room or the house.
• Pick battery-operated or LED lights where possible, and check battery compartments are secure.
• Tape cords flat along the skirting board where they cross the floor.

Some owners spray a bitter, pet-safe deterrent on cords. It can help, but it is not a guarantee, and it should not replace physical protection. Test it on a small area first, and check it is safe for pets and suitable for the surface.

Training matters just as much. Practice leave-it near the tree, rewarding your dog for looking away. Teach a mat command so your dog has a calm place to be while the tree is up. Make sure your dog has enough exercise and chewing outlets so the tree is less of a target.

Puppies and teething dogs are the hardest group, because chewing is a developmental need. For these dogs, the safest option may be to put the tree and lights in a room that stays closed when you are not there, or to use a sturdy pen around it.

Give your puppy a variety of chews so they have something appropriate to bite, and supervise carefully whenever they are near the tree.

Not all string lights carry the same level of danger. Knowing what you have helps you choose.

• Mains-powered incandescent strings: the highest risk of shock and burns, and bulbs can get hot.
• Mains-powered LED strings: cooler bulbs, but the cord and plug can still shock.
• Battery-operated lights: lower electrical risk, but batteries are a hazard if swallowed.
• Solar lights: usually low risk, but still contain small parts and batteries.
• Fairy lights with thin wire: easy to chew, and can break into sharp pieces.

Combine management with a clear message. Teach leave-it, and practice near the tree with the lights off. Reward your dog for sniffing and walking away, and for choosing the mat. Add a little distance, then turn the lights on, still rewarding calm behavior. Keep sessions short. If your dog tends to mouth cords, offer a chew in a different place, and take them away from the tree when you cannot supervise.

Young dogs chew everything in reach, and lights hang at the perfect height. In the first holiday with a puppy, consider placing the tree in a closed room, using a sturdy playpen around it, or putting lights only on the top half. Unplug lights whenever you leave the room. Provide a frozen chew or a cold teething toy to ease sore gums, and replace damaged lights immediately.

Note: If you ever find a chewed cord with exposed wire, switch off the power before touching it, and check your dog's mouth for burns or swelling. Call your vet.