My blue heeler has a yeast infection in one ear. Vet gave me drops to put in both ears every day for ten days. Wife and mother-in-law flew out of town for a wedding shower. Gone for three days. Ear drops were left in refrigerator, next to eye drops for father-in-law (age 87). I was keeping him while the wives were away.
Put the eye drops in the dogs ear every day. Never noticed I was using the wrong medicine. Dog is greatly improved but still can not see out of either ear.