I hope Mickey is feeling better soon!!
Ear infections are no fun!!
When we first got Abbey, we took her to our vet, and she said "you haven't been cleaning her ears have you?" Obviously not, since we just got her. Anyway, she had an infection--since her ears hang so low when she is sniffing, the moisture can get trapped in causing an infection. I am more vigilant about cleaning her ears now, and haven't had a problem since.