Canaural ear drops are effective against the micro organisms commonly associated with otitis externa including the ear mite otodectes cynotis and are specifically formulated for the treatment of otitis externa in the dog and cat a vet prescription is required for the medicine you have chosen if you do not yet have a prescription then you can print out the following blank veterinary prescription form which you can ask your vet to fill in when you next visit please note that changes to legisl