When Neo was about a year and half we went up to Coniston in the Lakes for the weekend, there was a big group of us and our friends took their cocker too.
Neo won't 'go' without a walk
so he'd have an amble round in the morning and then all of us walked up the 'Old Man', of course the dogs must have walked up and down it twice the twoing and froing they do.. They loved every minute of it getting soaked in the springs and charging about.
Day 2 Neo had his morning constitutional and then he went out again when Charlie (the other cocker) had his walk half an hour later.. and then we did another walk round another lake..
Even though we spent the rest of the time in side lounging around, by the time we went home on day 3, Neo was really stiff and walking badly.
It didn't seem to affect Charlie (who was younger and in my opinion shouldn't have been walked so far).
I wasn't sure if this was due to the hills as it's mostly flat in Herts, but this really worried me and we've been careful ever since. He wasn't walked huge distances as a puppy but this didn't stop him being affected.
I personally found it much harder when we got to dog no. 2 as Neo expects to get half an hour morning and evening off lead, whereas Jovi couldn't have this long.. We did alot of carrying (as much as you can with a wriggling cocker) however he probably did get walked more then he should have