Lea, I use this for my working cocker as I tried every different food combination / addition I could think of to his food and this was the only thing that really works as a preventative measure - I can now go far longer inbetween trips to the vet for anal gland emptying than before adding profibre to his food. It can be found cheaper at
http://www.hyperdrug.co.uk if you decided at any point you wanted to try it.
Tyby, I've been having troubles with Sam's anal glands for a good few years now and my vet only once mentioned removal of the anal glands and that was only in the context that it was an option but certainly as far as he was concerned, it would only be the last resort. For me, making trips to the vets every 4 months (give or take) to have them emptied is no real problem and Sam doesn't seem bothered by it until it's clear they need emptied, so our routine works. Sam's stools are always generally solid also: the vet just explains his problems as just one of those things-he simply doesn't empty them fully himself. Have you had problems with your boy's anal glands prior to this? If so, then I'd probably suggest being guided by your vet as to your dog's condition and the pros and cons of removal (there is a risk of faecal incontinence I believe) else wait and see if this proves to be a recurring condition before rushing into surgery.
Hope that helps :)
-Kay