I'm really not keen on an all-dry diet for dogs, tough on kidneys in the long run
My dog was diagnosed with kidney disease in February and the first question the internal medicine specialist asked me was "do you feed dry food?". At the time, and for years previous, he got a raw meal for dinner with a small amount of grain free dry for breakfast. He's now off dry all together and gets a mixture of raw, cooked and wet.
If feeding dry food, I would alway feed it soaked or with some wet food & water to make a nice gravy and bump up the moisture.
I would agree with avoiding Royal Canin like the plague.
Lily's Kitchen wet is great but I don't rate their dry - it's made with fresh meat, so the final meat content in the finished product (once moisture has been removed) is low.
To be honest, I don't really much buy into some foods being "too rich". Dogs are designed to eat high meat, grain is more likely to cause a stomach upset. And watch feeding quantities, overfeeding is such a huge cause of upset stomachs. Good quality diets are nutrient dense - your dog will be getting what they need from a portion that may look small, and it can be tempting to feed a little extra, which will just run through them.
Alfie has always had a bit of a sensitive belly so give slippery elm daily and always have tinned pumpkin in the cupboard, it's great for firming them up!