
Hi Bek,
z/d has it's place - as do other prescription diets for certain conditions. However (there's always one ;) ) the fact that your vet thinks it may be a food related reaction, there are certainly more economical and equally (if not more) effective ways of maintaining an exclusion trial diet :)
As one of the other posters had suggested, Wafcol's salmon and Potato diet (comes in puppy through to adult now) is a less expensive option and IMO it is preferable to feed a food in which the ingredients are totally novel to the dog rather than some of the standard used ones in multiple diets and certainly rather than opting for hydrolyzed diets at this stage.
Alternatively you could ask for an allergy test to be done by York - this would give a wider picture of what is and isn't suitable
should the problem be diet related.
If you do opt for an exclusion trial - whether with the Hills z/d or any other diet - please remember that
absolutely nothing by way of treats, tit-bits, chews, pigs' ears, table scraps, dregs of your cuppa, crust of your toast or licking your cereal bowl can be added - it really HAS to be to the exclusion of everything but the chosen diet.
Good luck - I hope you are able to find a quick and affordable solution.
best wishes, Teri :)
ps: Wafcol is currently on special offer at PAH - the Salmon & Potato diet (avoid the corn version) is nomally around £37 for 15kg