Unless the dog has a specific medical condition that requires him to be on a soft diet. Such as having a sensitive stomach, being endentulous, and some seniors, etc.
If the veterinarian that has examined the dog recommends a soft diet. Then by all means, soak away! Otherwise, dry food as a base with a topper and a splash of water works best, in my experience.
Healthy dogs don’t need supplements……IMO
You really should consult your vet for specific concerns pertinent to your dog.
PS: What is wrong with your dog that you are so worried?
