In this Nov. 5, 2019 photo, in St. Francis, Wis., Amy Carter looks at her Yorkshire terrier-Chihuahua mix Bentley, who has epilepsy. Carter, gives him CBD, which she says has reduced his seizures. The federal government has yet to establish standards for CBD that will help pet owners know whether it works and how much to give. But the lack of regulation has not stopped some from buying it, fueling a $400 million CBD market for pets that grew more than tenfold since last year and is expected to reach $1.7 billion by 2023, according to the cannabis research firm Brightfield Group. (AP Photo/Carrie Antlfinger)
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