Seresto Flea & Tick Collars for Large Dogs

Give your large dog long-lasting, odorless defense against fleas, ticks, and lice with the Seresto Flea & Tick Collar. Veterinarian-recommended and trusted by pet owners worldwide, this innovative collar uses polymer matrix technology to continuously release low concentrations of active ingredients, killing and repelling parasites through contact—no bite required. Water-resistant and non-greasy, it provides up to 8 months of uninterrupted protection for dogs over 18 lbs (8 kg).

Key features

• 8 months of continuous protection – Kills and repels fleas, ticks, and lice for up to 8 continuous months with a single collar.

• Contact-action technology – Polymer matrix releases active ingredients that kill parasites on contact; no bite required for effectiveness.

• Kills fleas within 24 hours – Eliminates 98–100% of adult fleas within 24 hours of application.

• Repels and kills ticks – Actively repels ticks (anti-feeding effect) and kills them within 48 hours, reducing disease transmission risk.

• Water-resistant – Remains effective after bathing, swimming, or rain exposure (once dry); avoid excessive bathing (no more than once per month) to maintain full 8-month efficacy.

• Odorless & non-greasy – No unpleasant smell or oily residue; comfortable for daily wear.

• Safe for dogs and puppies – Suitable for dogs 7 weeks and older, weighing over 18 lbs (8 kg).

Specifications

• Brand: Seresto (Bayer Animal Health / Elanco)

• Product name: Seresto Flea & Tick Collar for Large Dogs

• Active ingredients:

  • Imidacloprid: 10.0% w/w (4.5 g per collar) – Neonicotinoid insecticide that kills fleas and lice

  • Flumethrin: 4.5% w/w (2.03 g per collar) – Pyrethroid acaricide that repels and kills ticks

• Dosage: 1 collar per dog for 8 months

• Weight range: Over 18 lbs (8 kg)

• Collar length: 27.6 inches (70 cm) – adjustable to fit necks 10.5–23 inches

• Collar width: Approx. 0.5 inches (1.2 cm)

• Age suitability: 7 weeks and older

• Color: Typically gray or silver (varies by packaging)

• Water resistance: Effective after bathing/swimming once dry; avoid excessive bathing (no more than once per month)

• Storage: Store at room temperature (20–25°C / 68–77°F); keep in original sealed pouch until use

• Prescription required: No (available over-the-counter in most regions)

Benefits

• Long-lasting protection – Up to 8 months of continuous flea and tick control with a single collar, eliminating the need for monthly applications.

• Rapid flea kill – Eliminates 98–100% of adult fleas within 24 hours, reducing itching, flea allergy dermatitis, and environmental infestation.

• Tick repellency & kill – Repels ticks (anti-feeding effect) and kills them within 48 hours, preventing disease transmission (e.g., Lyme disease, ehrlichiosis, Rocky Mountain spotted fever).

• Contact-action efficacy – Works through direct contact; parasites die before biting, reducing stress and irritation for your dog.

• Water-resistant formula – Remains effective after bathing, swimming, or rain exposure (once dry); ideal for active, outdoor dogs.

• Odorless & non-greasy – No unpleasant smell or oily residue; comfortable for daily wear and close contact with family members.

• Safe & well-tolerated – Clinically proven safe for dogs and puppies 7 weeks and older; minimal side effects reported in clinical trials.

• Aids in sarcoptic mange control – Helps manage mite infestations in addition to fleas and ticks.

Ideal for

• Large breed dogs over 18 lbs (8 kg):

  • Golden Retrievers, Labrador Retrievers, German Shepherds, Boxers, Bulldogs, Rottweilers, Doberman Pinschers, Bernese Mountain Dogs, Great Danes, Mastiffs

• Dogs with:

  • Active flea or tick infestations

  • Flea allergy dermatitis or itchy skin

  • Exposure to outdoor environments (parks, trails, yards, wooded areas)

  • Multi-pet households needing comprehensive parasite control

• Year-round prevention in:

  • Warm, humid climates with high flea/tick activity

  • Seasonal peaks (spring, summer, fall)

  • Indoor/outdoor dogs requiring continuous protection

• Active, water-loving dogs who swim or bathe frequently

How to apply Seresto collar

1. Remove from packaging: Take the collar out of its protective pouch immediately before use.

2. Unroll and inspect: Fully unroll the collar and remove any plastic connectors or remnants from the inside.

3. Fit around the neck: Place the collar around your dog's neck (not on a leash or harness); thread the end through the buckle and loops.

4. Adjust for snugness: Tighten until you can comfortably fit two fingers between the collar and your dog's neck.

   • Too loose: If three or more fingers fit, tighten slightly.

   • Too tight: If fewer than two fingers fit, loosen the collar.

5. Trim excess length: Cut off any excess collar extending beyond 1–2 cm past the buckle (leave extra length for growing puppies).

6. Position correctly: Ensure the collar sits close to the base of the neck, not near the ears or throat.

7. Check regularly: Recheck the fit weekly, especially during the first month, as the collar may soften and shift over time.

8. Optional concealment: Use Seresto Concealment Clips to hold the collar under your dog's regular collar for walks or shows.

Important safety information

• For external use only – Do not allow your dog to chew or ingest the collar.

• Age & weight restriction: Not for use on puppies under 7 weeks of age or dogs under 18 lbs (8 kg).

• Bathing guidelines: Avoid excessive bathing (no more than once per month) to maintain full 8-month efficacy. For dogs that swim or bathe more than once per month, protection may be reduced to 5 months for fleas and 7 months for ticks.

• Side effects (rare): Mild, temporary skin irritation (redness, itching, or hair loss) may occur at the collar site. Rarely, neurological signs (tremors, lethargy) or digestive upset (vomiting, diarrhea) may occur. Contact your veterinarian if symptoms persist.

• Human safety: Wash hands after handling the collar. Keep out of reach of children. Do not allow children to play with or chew the collar.

• Multi-pet households: Treat all dogs and cats in the home simultaneously to prevent cross-infestation.

• Storage: Store in a cool, dry place away from direct sunlight and heat; keep in original sealed pouch until use.

• Disposal: Fold the used collar in half (sticky side in) and place in the original pouch or a sealed bag before disposing in household trash. Do not flush.

Why choose Seresto?

• Trusted brand – #1 veterinarian-recommended flea and tick collar worldwide.

• Long-lasting efficacy – Up to 8 months of continuous protection with a single collar, eliminating the need for monthly applications.

• Contact-action technology – Kills and repels parasites on contact; no bite required for effectiveness.

• Water-resistant – Effective even after bathing, swimming, or rain exposure (once dry).

• Odorless & non-greasy – No unpleasant smell or oily residue; comfortable for daily wear.

Package includes

• 1 × Seresto Flea & Tick Collar for Large Dogs (27.6 inches / 70 cm)

• 1 × Protective pouch (for storage and disposal)

• 1 × Product information leaflet & safety guide

Tips for best results

• Consistency is critical: Replace the collar every 8 months to maintain uninterrupted protection.

• Treat all pets: Ensure all dogs and cats in the household are treated simultaneously to prevent reinfestation.

• Combine with environmental control: Vacuum carpets, wash bedding, and use flea sprays in the home for severe infestations.

• Monitor for ticks: Check your dog regularly, especially after outdoor activities, and remove any ticks promptly.

• Consult your vet: If your dog has a history of skin sensitivities or medical conditions, discuss use with your veterinarian before starting treatment.

Pro tips for application

• Two-finger rule: Always ensure you can fit two fingers between the collar and your dog's neck for a snug, comfortable fit.

• Trim excess: Cut off any excess collar length beyond 1–2 cm past the buckle to prevent chewing or snagging.

• Check weekly: Recheck the fit weekly, especially during the first month, as the collar may soften and shift over time.

• Position correctly: Place the collar close to the base of the neck, not near the ears or throat, for optimal contact and comfort.

• Concealment clips: Use Seresto Concealment Clips to hold the collar under your dog's regular collar for walks or shows.

A premium, vet-trusted solution for long-lasting flea and tick control—giving your large dog the protection they deserve against parasites and the diseases they carry.

Shipping (8–14 business days)

If for any reason you are not happy with your purchase, you may return the item(s) within 15 days of receiving the order. Please note that monogrammed, personalized, special-order items and items damaged through normal wear and tear are not eligible for return. Products must be returned in new condition so they can be sold to the next customer. If this is not the case, a refund will not be issued.