I have an 8 year old Husky who was diagnosed with Blastomycosis a few weeks ago. My vet put him on Intraconazole. After a few days, he started eating a little bit of beef, porkchops and chicken. After a few days his appetite became a little better and would eat a few bites several times a day.

Three days ago, he quit eating all together. When I would take him out to urinate, he would try to eat grass. He is getting very weak now, and still will not eat.

My vet is at a loss as to what to do. Any suggestions.Thanks!

Eating grass could be a sign his stomach is bothering him. Even the best vets struggle with the patient not being able to explain the problem. Perhaps you might have another vet check him. Another vet may not be any more competent, but will have different experience and maybe see something you regular vet didn't.

I don't think the answer is a more tempting diet.

I would certainly advise taking him to another vet, but it definitely sounds like his stomach is bothering him. It may be the medicine, but may be completely unrelated. He could have a bowel obstruction or something to that effect. I would get to a different vet immediately.
Another thing I would try is Pepto Bismol; it is safe for dogs and is very effective in coaxing a dog to eat when he/she has an upset tummy.
Good luck!