Chihuahua collars are fairly simple to shop for because most collars are easily adjustable to fit a chihuahua. Though there is some debate whether or not it’s safe to use a collar for a chihuahua. You want to be particular when deciding if a collar is right for your chihuahua. If he or she seems to be very hyper and bolt off at things randomly then it could be dangerous. Chihuahuas have a very fragile trachea and a collar is going to pull directly on it. A chihuahua harness may be much better for your little dog.