Read the product label before fitting

Flea and tick collars differ in active ingredients, intended animal, size range, age limits, precautions, and wear instructions. Read the exact label and package for the collar you have. The DEWEL product page lists an adjustable 63.5 cm collar for medium and large dogs; verify the current listing and instructions before use. Do not apply a dog product to a cat unless its label explicitly allows it.

If your dog is very young, pregnant, nursing, unwell, taking medication, or has a history of skin sensitivity, ask a veterinarian before using a flea product. Do not combine collars with sprays, spot-on treatments, or other parasite products unless a veterinary professional or the product label says the combination is appropriate. The product description is not a substitute for directions on the package.

Measure the neck and check the collar range

Use a flexible measuring tape around the part of the neck where the collar will sit. Keep the tape comfortably close without pulling it tight, and note the measurement. Compare that number with the collar’s adjustable range, not only with the maximum length printed in the title. A collar that cannot be adjusted within its instructions is not the right fit.

Check the size against the dog’s current coat and body condition. A thick coat may change how the collar sits, but it should not be tightened enough to compress fur or skin. If you are uncertain between sizes or your dog is growing, consult the product instructions or your veterinarian rather than guessing.

Fasten it with the label’s stated clearance

Follow the exact fitting directions for that collar. Some products specify a particular gap between the collar and the neck; use the stated clearance rather than applying a universal rule. Make sure the buckle or fastener is fully engaged, the collar lies flat, and the dog can move its head and neck comfortably.

Trim excess length only if the label tells you to and only after you have confirmed the fit. Keep any required tail length and dispose of cut sections as directed. Avoid leaving a long loose end that can catch on branches, furniture, or another pet. Do not tie the collar or add accessories that are not approved by the manufacturer.

Monitor your dog after the first fitting

Observe your dog after fitting and follow the label for when to check the skin and how often to recheck the fit. Look for redness, itching, swelling, hair loss, unusual behavior, or discomfort around the neck. If a reaction or concerning symptom appears, remove the collar if the product directions advise it and contact a veterinarian promptly.

Wash your hands after handling the collar and store unused collars away from children and animals. Keep the packaging so you can refer to ingredients, lot information, precautions, and support details. If your dog chews or mouths the collar, stop and seek veterinary guidance; ingestion can require prompt professional advice.

Recheck fit and replacement directions over time

Check the collar after grooming, bathing, rapid weight change, or a change in coat length. Follow the product label for water exposure, cleaning, and replacement timing; do not assume every collar has the same duration or remains effective after every activity. Mark the date of fitting and any date stated on the package to make later checks easier.

A properly fitted collar is only one part of parasite prevention. Check your dog and bedding as advised by your veterinarian, and discuss a prevention plan suited to your area and pet. If the collar slides, irritates skin, becomes damaged, or no longer fits within the specified clearance, stop and follow the label or seek professional advice before using it again.