| IMHO, beyond 6 months. Not all dobes mature at the same rate. Mine was particularly slow to mature. His ears were up and pretty at 15 weeks. By 8 months they were falling. When I had him neutered at 8.5 months, he still had baby teeth that the vet had to pull. Every dog is different. Allow the ears the chance to stand, when they start to fall, immediately retape. Give it another couple of weeks and try again. Show crops take a bit longer, sometimes up to 16 months. Depends on the dog. Shorter crops take less time but, I've seen these fall too. There are a lot of issues.... the crop itself, the ear cartilage of the specific dog, the line he/she was bred off of, the post-op recovery, and the dog themselves. Some dogs are just lazy. You can help the process by playing games.... follow the light, plucking popcorn at the dog when he/she isn't watching. Don't despair, most dobes have the ears up and pretty by 12 months. Good luck to you. | 
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