Hello and welcome to the forum. Your question is an interesting one. You can find information under the 'Feeding' tab of this website, and
The Feeding Guide might be useful. Like you, I have two dogs and here are my thoughts on the matter of choosing food:
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Activity level and general health - my dogs are fit and well but not all that active so I wouldn't feed anything that is high in fat and protein, particularly as one of them puts weight on easily.
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Budget - I once used a good quality wet food but I realised that it was costing me a lot of money. When added it to insurance and other things, it was simply too expensive. Also, the dogs did not seem to do all that well on it. It was a lesson - sometimes a cheaper product may be best.
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Health - the dog's poo should be dark brown in colour, always firm/easy to pick up. Skin, coat, eyes should be healthy. There should be no scratching, nibbling of paws and the dogs should not be malodorous.
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Ingredients - I always read the ingredient list and try to understand what it contains. Meat should always be named and at the top of the list. The Dog Food Directory on this website makes it easy and when searching I always place a tick in the 'no red ingredients' box.
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Same food - I like to feed them the same as it makes it easier and cheaper for me.
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Type of food - I use a dry, non extruded food but they have wet food occasionally for a change. Dehydrated dog food e.g. Pure and ones that mimic home feeding, e.g. Freshpet (Asda/Tesco) and Butternut Box look interesting. For a dog who has a sensitive stomach and bowel problems it might be best to stick with just one type of food.
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Variety - my two regularly get toppers e.g. cooked vegetables, chicken, sardines, scrambled eggs, fish. These are in addition to their usual food but in order to keep them at a good weight I reduce the quantity slightly (no more than 25%).
You could also use the filters on the Dog Food Directory and if you need help with this, please ask. Others may have different priorities so I look forward to hearing views on this.