I read an article by a vet that said it's not uncommon for the ears to go down again a couple of times - especially whilst teething and after desexing, but they'll usually go up again by 20 weeks. Another article said they should go up between 26 and 30 weeks. At the end of the day if taping doesn't work I'll still love Carlos asuch ad I love Ella, but taping is not frightening or distressing him so Ill give it a go for a week or two. I found it's less annoying for him to tape the hairy side only and I've put a cotton tip under a wide strip of fabric tape about 2cm in from the outer edge of the ear - like a splint. It has to be redone every day but the ears are staying up better already. I'd add a photo but I dont know how????