Mine is 8 months and still goes floppy eared on his right ear if he's really worn out / tired .
Teething really takes it out of our little babes, so that would be my first guess.
If its really a concern, trim down the hair on the ears to reduce the weight and if that doesn't help, do a search on Yorkie talk about taping your pups ears.
But, honestly, unless your planning on showing/breeding ... it doesn't really matter what your pups ears look like. |