Cropping is done between 8-12 weeks (usually around 10). So yes-- once he is over 12 weeks old it is most likely to late. It can also be hard to get a vet found and scheduled. Like I said - I had to take a day off work and take Ninya 2 hours away for her crop and I know many people that go 4+ hours. So--- if you do want a crop you really need to have the appt set up when they come home.