[anonymous]

“Someone else suggested going to chicken and rice for 4 days”

If you try this, the chicken should be boiled, bland and chopped up. Rice should be soft, mushy, overcooked.
Classic remedy for dogs with diarrhea, however, more than 3 days could cause the opposite, constipation. You said your dog has loose stools, not diarrhea?

It may be best if you go just by what the vet that has examined the dog recommends, for now.