Excellent jacket with built in harness. Really good quality, and seems to cope with a quick scrub rather than a full wash when muddy.
Not the cheapest, but after going through several less expensive but less well designed and less well made alternatives, I wish I had just got this one sooner.
I bought a size S for our large (almost springer sized) 4-year old working cocker, and it fits well. Almost on the large size, so for anyone with a smaller cocker definitely go for a smaller size.
I just wish Ruffwear did some brighter colours. An orange would be especially welcome.