1 If the smelly ear is due to ear mites you need to clean the thick accumulated ear wax. You can do so using 0.1% ivermectin, which kills the mites.  The water retained in your dogâs ears after swimming or bathing can be a source of bacteria and yeast infections.
And treatment is simple. Most yeast infections are caused by a type of yeast called Candida albicans. A healthy vagina has many bacteria and a small number of yeast cells. The most common bacteria, Lactobacillus acidophilus, help keep other organisms-like the yeast-under control.
Candida infections, also called candidiasis, are often referred to as yeast or fungal infections. When they occur in the mouth and throat, Candida infections are called thrush. The most common sites of infection include the mouth and throat, the genitals, and moist skin folds. Candida can also cause a systemic, or body-wide, infection, but this is very rare, occurring in less than 0.1% of cases every year in the United States (Source: CDC).