Okay, wondering how worried should I be. Our pup is 5 1/2 months old. I know ears can go up and down during the teething phase, and I'm pretty sure he's still teething (chews on everything!). Thing is, when we purchased him last month, his litter mates ears were already standing strong. His ears go up when he's interested in something, and one day one will be up most of the say, but then flop over towards his forehead. Today both are completely floppy again, although go up as I said when he's chasing frisbee. So, should I be worried? Should I start taping? I guess what worries me most is that sister and brother already had their ears up early. Breeder said they'd never had a puppy who's ears didn't go up, and past customers have submitted photos to her Facebook page and pups all have lovely alert ears. Mom and Dad dogs had erect ears too.