You will need scissors and tape.  The tape to use is Elastikon -- you can purchase from your vet or a medical supply store.  One strip of tape is attached to the  underside of one ear w/sticky side facing towards the outside of the ear (dots on the tape indicate sticky side).  Then pull tape down under the chin and attach to the underside of the other ear.  Next attach the other piece of tape -- (with ears in the middle -- sticky side to sticky side) - to the first piece of tape.  Make sure it is a comfortable fit so that your dogs jaw is not too tight.  Make sure he can move his jaw and is able to eat and drink.  It is also important to make sure the tape is not too loose so it doesn't get caught in the jaw.  Tape length on average should be 5 to 6 inches long.

I highly recommend tacking your dane puppy at the time of spaying or neutering.  Bloat is very prominent in the dane breed.  The cause is still not known.  While tacking is not a guarantee that your dog won't bloat -- in most cases it will prevent the dog's stomach from twisting and doing damage to the surrounding organs.   Please do not be misled into thinking puppies won't bloat -- PUPPIES BLOAT TOO - although it is not as common in puppies it can still happen.