When using a slip lead, it's generally recommended for dogs at least six months old and who have acquired basic leash manners. By this age, they have typically developed the necessary understanding and impulse control to respond appropriately to the pressure and cues provided by a slip lead. However, every dog is unique, so assessing your furry friend's maturity, size, and training level is essential. Focusing on foundational training and introducing them gradually to leash and collar usage is a more suitable approach for younger puppies. Patience and proper guidance are key to ensuring a positive and successful experience with a slip lead.