[anonymous]

I am glad your vet is referring you to an internal medicine specialist. I hope he quickly diagnoses your dog’s condition and starts an effective treatment.

In my opinion it is best to go by the treatment plan that your vet has provided.
Including the prescription food. Don’t add anything other than the home cooked your vet approved.
Not all supplements/probiotics/enzymes are benign, some have interactions and may interfere with the absorption of prescription meds. That includes over the counter meds.

So, I would not give anything unless your vet approves. Seriously, you can make things worse.