It has been suggested to me that this food has a higher sodium level than some. hence dog drinking alot. has been checked out by the vet. all ok.  has anybody any thoughts on this. thanks

Have you checked with the company on the sodium content and compared it with other brands?

just looked at the bags ( All per 100g) for Burns - 0.51%, Luath - 0.11%, JWB - listed but no figure but sodium is further up the list than on the other 2 which would mean (prob) a higher %.
dont know if this helps you at all.
Chris

thank you for that didnt think to look where it appeared in the list.