DEAR READERS: The Better Business Bureau issued a warning late last year about online pet-sale scams that use COVID-19 as an excuse to avoid in-person transactions. The BBB received 337 complaints about puppy scams in November, compared with only 77 in November of 2019. Many pups sold online are from puppy mills, an issue I will cover in a future column in more detail. DEAR DR. FOX: We just took our 3-week-old goldendoodle to the vet. DEAR DR. FOX: It amazes me how many people buy pets without doing their homework.