Seresto Vet-Recommended Flea Collar… 8-Month Protection Compared We’ve been testing the Seresto Large Dog Collar for several months, and it’s been a standout in our flea and tick prevention efforts. True to its promise, our dogs over 18 lbs have enjoyed 8 months of relentless protection from fleas and ticks, and we appreciate the vet-recommended seal of approval. The collar’s comfortable fit ensures our pets don’t mind wearing it, while the slow-release active ingredients work silently to repel pests. Unlike some treatments we’ve tried, there’s no messy spray residue, and the protection is evenly distributed over the skin. While the upfront cost is higher than spot treatments, the convenience and longevity make it worthwhile. We’ve noticed fewer interruptions from pests, and the family is more relaxed around pets. So far, it’s one of the most reliable collars we’ve encountered.