I do it when the clocks change. There is absolutely no point doing it before then as her coat won't be through and I'll only have to do it again two or three weeks later.
I would lie to say when mines fluffy and get sweaty and doesnt dry when sweaty but im got a bit of a tidy freak and i do it when the showing seasons finished and he starts looking messy usually beggining to mid october!
Yer i proaly wouldnt if i had to pay or he was naughty but i clip myself and it takes me half hour max so doesnt matter if i have to do every other week!!! I dont clip to late as he shows mid to end of december i stop. He had a full summer coat by may ready for early showing.]
Yep cobbies are different i do a few for people all through the summer as they just get so hairy a sweaty, it also helps them stop etting leg mites.
As late as possible as he's a nightmare to do & has to be sedated so I've got it down to a fine art now - leave it late, clip the lot off & tons of rugs - only have to do him once a year now!!