I think it's because they're eternal optimists and are always looking for the next exciting thing to do - Jarv is like Coco but with boy traits (ie he's not as calculating as a girl).
Training classes with lots of other dogs are incredibly difficult for some dogs - especially busy little dogs who have to see and do everything like working cockers.
When Jarv was 6 months old training turned to mud - my breeder said it would and it - he said to just re-affirm your existing training, only train for very short bursts, and look forward to post-adolescence
I noticed at around a year I was getting way more eye contact and he was checking in with me loads more,
and that's when I started training him again properly. and that's when he started training ME properly....
TBH I love the way working cockers act - I even love the fact that I directed Jarv in one direction today - he looked at me as if I was a total idiot and went in completely the opposite direction .... and flushed a pheasant right over my head. He came back sat at my feet and looked at me with a look that said 'the working cocker knows best'....