Some breeds of dogs naturally have floppy ears, which crease at the midpoint of the ear. Other breeds require a little guidance, as their ears may pop straight up, especially when they are puppies. If this is not corrected before they reach adulthood at age 1 or 2, their ears may stay up permanently.
Clean the inside of the ears with rubbing alcohol and cotton swabs. Allow the area to dry for a few minutes. Peroxide may be substituted if preferred.
Determine how far down you are going to fold over the ears. This varies from breed to breed, and should appear natural and relaxed.
Apply puppy ear glue to the inner top edge of each ear. You may choose to smooth some of the surrounding hair into the glue, to provide additional grip when the glue dries.
Place additional glue on the inside of the ear, where the tip will be placed. The ear should be folded down, and the tip will be to the inside of the ear.
Fold the ears down, and press the ears into place. Take a look at ears to make sure they are placed correctly and naturally.
Use a strip of adhesive moleskin to secure the ears. This can be either applied to just one side of the ear, or around the entire ear, depending on the thickness of the ear.
Check the placement of the ears over the next few days, and adjust as necessary. Let the glue wear off naturally if possible. If the ears need to be unglued before then, use a solvent that is safe for dogs.