What is the best flea protection for a large dog?

He's on apoquel for itching, and has a seresto collar. last week his ithing got worse and I saw fleas on a bear spot at the base of his tail. I gave him a flea bath and CapStar, but the fleas were back today so I gave him another CapStar. The seresto is 3 months old. I take it off when I bathe him, But we... show more He's on apoquel for itching, and has a seresto collar. last week his ithing got worse and I saw fleas on a bear spot at the base of his tail. I gave him a flea bath and CapStar, but the fleas were back today so I gave him another CapStar.

The seresto is 3 months old. I take it off when I bathe him, But we have been caught in the rain a few times. He has not had any ticks.
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