Speak to your vet about lypex capsules also.
Cockers can be prone to it, although I found it was more in the show/pet ones than the working ones. Can be very serious and acute all the way through to more of a chronic issue.
If this is the first time it's happened in a dog which is seven, in the back of my mind I'd be wondering 'what's changed?' as well as the usual 'what's caused it?'.