no but some people think there is because the lad I went out with couple of nights ago believed not to get them out till a least 12 months of age but he couldn't believe how my pup was working at under 8 months. Might not work for all types but I've listened to a chap who has had dogs for years and glad I did because he's doing well and I've had all the fun of watching him learn as a pup I think it easer to talk and teach them at that age rather than trying to start at a later stage. When I go out now I hardly say two words to him all night.