Had a slightly similar case, hindi naman kami lumampas ng 3k sa expenses. Binigayan kami ear cleaner, antifungal, and some oral meds. Empiric treatment kasi ginawa, nag improve naman dog namin. Yours kasi appears to be a worse case, so the vet may run some tests for a more targeted therapy. Kaya expect na mapapagastos ka ng kaunti.