I started training Hollie using click and reward when she was 4 months old and got no where with her. She did not seem capable of learning anything. In the end I gave up because we were both getting frustrated. She is now 14 mths old and just recently to my amazement she will come when I click the fastener on her lead. Is it too late to start over, and should I start at the beginning. Advice would be appreciated. Thanks.