Can You Have An Ear Infection And Not Know It My Puppy Could Not Stop Scratching Her Ear All Night Last Night...is It An Infection?

My puppy could not stop scratching her ear all night last night...is it an infection? - can you have an ear infection and not know it

My Havanese, Millie, usually through the night in the box without any problems, but yesterday could not stop scratching his ear. I'd use a flea and tick preventive medicine yesterday and I bathed a few hours before bedtime. Could an allergic reaction to medication for fleas and ticks? Or is it an ear infection. She scratched all SECODI 30-45! Thank you!