Well said Fella but i've found that by 15 months you will know what you have especially with black dogs. Some breeds will take longer to start, use to keep lakelands away back ten years ago and it was nearly 20-24months before some of them started as they can be slow but the black dog usually wants it from the off, have to be careful with this though as you will have to make sure you don't spoil him/her too young.
I keep seeing the phrase "black dogs",what does it mean?
patterdale/fell! use ur skull or rya takin da fack'n piss