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Kills and Repels
Kills and repels fleas and ticks by contact so pests don’t have to bite your dog to die.
Same-Day Effectiveness
Starts to kill and repel fleas within 24 hours of initial application and kills reinfesting ticks in as few as six hours.
Vet-Recommended
Seresto is the #1 veterinarian recommended flea & tick collar.*
*Based on survey data, 2023
How to
Step 1
Be sure to attach the collar tight enough to ensure the collar is always coming into contact with your dog’s skin and hair.
Step 2
Use the 2-finger rule: insert the end of the collar through the buckle, then adjust the collar so that it is possible to hold two fingers comfortably between the collar and the neck.
Step 3
Pull excess collar through the loop(s) and cut off extra collar, unless it is on a growing puppy. See package insert for details.
Frequently Asked Questions
How long does it take to work on fleas?
Seresto kills existing fleas on dogs within 24 hours after application. After those 24 hours, new fleas are killed within 2 hours.
How do I know if the Seresto collar I purchased is authentic?
It is crucial that pet owners purchase real and genuine Seresto products from authorized and trusted retailers. Counterfeit collars and their packaging look very similar to the actual product. Be sure the collar does not have a greasy feel or an odor.
Does it expire?
There is no expiration date required on the packaging.
The product should be kept in its original packaging and stored as directed on the label.
What are the key ingredients?
The active ingredients in Seresto collars are Imidacloprid and Flumethrin: Imidacloprid to help protect against fleas and Flumethrin to help protect against ticks. No other product has this combination of ingredients.
 Seresto Flea Collar |  Advantage II Large Dog |  Advantage Dog Treatment Shampoo | |
|---|---|---|---|
| Customer Reviews | — | — | — |
| Price | — no data | — | — |
| Form | Collar | Topical Drops | Flea Shampoo |
| Treatment or Prevention | Treatment + Prevention | Treatment + Prevention | Treatment |
| Application Frequency | Every 8 months | ? | ? |
| Kills Fleas? | ? | ? | ? |
| Kills Ticks? | ? | ? | ? |
| Kills Mosquitos? | ? | ? | ? |
| Kills Lice? | ? | ? | ? |
| Starts to Kill Fleas Within | 24 hours | ? | ? |
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Kills and Repels
Kills and repels fleas and ticks by contact so pests don’t have to bite your dog to die.
Same-Day Effectiveness
Starts to kill and repel fleas within 24 hours of initial application and kills reinfesting ticks in as few as six hours.
Vet-Recommended
Seresto is the #1 veterinarian recommended flea & tick collar.*
*Based on survey data, 2023
How to
Step 1
Be sure to attach the collar tight enough to ensure the collar is always coming into contact with your dog’s skin and hair.
Step 2
Use the 2-finger rule: insert the end of the collar through the buckle, then adjust the collar so that it is possible to hold two fingers comfortably between the collar and the neck.
Step 3
Pull excess collar through the loop(s) and cut off extra collar, unless it is on a growing puppy. See package insert for details.
Frequently Asked Questions
How long does it take to work on fleas?
Seresto kills existing fleas on dogs within 24 hours after application. After those 24 hours, new fleas are killed within 2 hours.
How do I know if the Seresto collar I purchased is authentic?
It is crucial that pet owners purchase real and genuine Seresto products from authorized and trusted retailers. Counterfeit collars and their packaging look very similar to the actual product. Be sure the collar does not have a greasy feel or an odor.
Does it expire?
There is no expiration date required on the packaging.
The product should be kept in its original packaging and stored as directed on the label.
What are the key ingredients?
The active ingredients in Seresto collars are Imidacloprid and Flumethrin: Imidacloprid to help protect against fleas and Flumethrin to help protect against ticks. No other product has this combination of ingredients.
Seresto Flea Collar | Advantage II Large Dog | Advantage Dog Treatment Shampoo | |
|---|---|---|---|
| Customer Reviews | — | — | — |
| Price | — no data | — | — |
| Form | Collar | Topical Drops | Flea Shampoo |
| Treatment or Prevention | Treatment + Prevention | Treatment + Prevention | Treatment |
| Application Frequency | Every 8 months | ? | ? |
| Kills Fleas? | ? | ? | ? |
| Kills Ticks? | ? | ? | ? |
| Kills Mosquitos? | ? | ? | ? |
| Kills Lice? | ? | ? | ? |
| Starts to Kill Fleas Within | 24 hours | ? | ? |