Dog has soft stool or diarrhea

[Kita]

Hello all, My dog has had diarrhea/soft stool for about 3 months sometimes real runny other times formed but soft. Took her to my Veterinarian he took blood and stool sample. Now can he tell by these samples if she has IBD/S or
digestive issue. He thinks it is IBD he is not sure and wants me to
see a specialist. So do I go to another Veterinarian for a second
opinion or go straight to the specialist. My Veterinarian gave her
stool hardener, put her on a high fiber diet neither worked so I got
him to give her a dewormer and I put her back on a taste of the wild
bison food but I soak it in water so it is easier on her stomach.
Since the dewormer and food change her stool is usually formed still
soft and has the odd runny one. Guess I am asking for direction...a
second opinion? or specialist.