A savvy dog trainer has revealed the 'only tip you need' to prevent your pooch from yanking on the lead - and pet owners are hailing it as a 'game changer'. The expert from Southend Dog Training took to social media to divulge his top trick for mastering control over your furry friends during walks, promising a more enjoyable time outdoors for both. In his enlightening video, he advises: "If your dog pulls on a lead, listen to this. Do this one thing and it'll change how your dog walks. Instead