By Isabelle Bates & Rom Preston-Ellis Millions of people in the UK have a pet dog, but one animal expert has outlined the mistakes that many owners are still making. This is in spite of the Labrador, Charlie, most likely enjoying some of them. But the risk to his health and wellbeing is too great, Dr Marcus added. He posted a video on TikTok with the advice to his 28,000 followers. And the clip has been viewed more than 2.3million times. The vet, who is based in America, talks to the camera in the video as he poses with Charlie. Scroll down to read the five things he would never do with his do…