Depends on how many numbers you have access to and how big they are. The other halfs old bitch pup was on suckers at about 3/4mths old and never looked back, but my bitch didn't have as much exposure so young and has taken a lot longer to get going, but was having a go with the others at about 10/11mths. It really comes down to the dog and the enviroment you're in. But have found that they are not a long time maturing as some other breeds are. Well that's my opinion anyways.