My puppies ears are doing the ear dance, and I read somewhere that once I see them go up, they'll be up once he's done teething. Is this true? Because they were both up at one point. He's 19 weeks now and only one is up and not solidly up, it's still floppy. Also the tip of that ear that is up is slightly curving back, is this normal? Will it straighten out? I don't want to have to tape them up.