I don't have experience with that med but have used Otomax on Ellie.
I always just do what the vet says because they have experience in knowing how long it takes, so I'd do it for 10.
If Darwin is cooperative, your friend should be able to do it.
__________________ Crystal  , Ellie May (RIP)  , Rylee Finnegan  , and Gracie Boo🐶 |