Hello and welcome to the forum. Is this
the Wainwright's Salmon and Potato that you are currently feeding? If so, I cannot find it in the Dog Food Directory but the Instant Review Generator returns a nutritional rating of 70% with no red ingredients:Composition: Salmon Meal (26%), Potato Starch (26%), Brown Rice (15%), Whole Grain Barley (14%), Rapeseed Oil (7%), Beet Pulp (6%), Linseed (4%), Alfalfa (1%), Dried Seaweed (0.3%), Minerals, Dried Yucca (0.02%), Dried Marigold (0.005%)
Protein is on the low side at 21%, fat 11% and it will have an above average carbohydrate content. In these circumstances it would be helpful to look for a wet food that will add balance so it needs to be low in carbohydrate and high in protein. Using these filters in the Dog Food Directory, it returned four pages:
Type of food - wet
Food properties - clearly labelled
Rating - 75% to 100%. I used this because it returns the higher meat content products.
Avoid ingredients - all red, all yellow
You could also use the nutrient level sliders if you wish.
I cannot reproduce those four pages here so you will need to do this yourself. You can then click on the ones you are interested in and check the dials at the bottom.
Some of them can be found in your local pet store but you may have to shop online for others. Click on 'Shop for this food' to find shopping outlets. Butchers tripe wet is readily available in supermarkets and Freshpet is sold in some of the larger ones. Variety is good for dogs so if there are some wet foods that have more than one flavour that is an advantage. Natures Menu Country Hunter is one such product.
If you are able to cook for your dog, enhancing dry food with fresh cooked can provide balance, extra nutrients and can be cost effective. There is a thread here
which may be helpful.