Question: Boxers are ranked by weight and what else?
About the article "Boxing", section "Boxer rankings".

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Legendary Champions is a 1968 documentary film written and directed by Harry Chapin featuring old boxers in action.
There are many scenes that show the boxers outside the ring, including some that are the only ones of their kind.
Several early boxers, John L. Sullivan for example, are shown in the only film ever taken of them.
The film of the Dempsey-Willard fight is very violent.
The documentary includes as history of Jack Johnson out of the ring.
The narrator incorrectly states that Jack Johnson is seen picking a defeated boxer's teeth out of one of his gloves.
The attire worn by some of the early boxers is more revealing than what modern-day boxers use, and to the other extreme, tights were even worn by some boxers.
The film was nominated for an Academy Award for Best Documentary Feature.  
The game gradually replaces aging or low-ranked boxers (including Holyfield) with new ones as Career Mode progresses.
The 30 default boxers are: Jeff Godfrey is automatically retired to make way for the player's created boxer when starting Career Mode.
Alan Beast is also retired if a second boxer is created.
The 20 unlockable boxers are:There is also a secret boxer named “The Beast” with green skin and (unique) silver trunks.
He is unlocked by entering said name at the “New Boxer” screen in career mode.
The Beast has full Strength, Stamina, Speed and Defense ratings from the beginning. 
Fritz Sdunek trained many boxers, both professional and amateur. 
Boxers are a bright, energetic and playful breed and tend to be very good with children.
They are active, strong dogs and require adequate exercise to prevent boredom-associated behaviors such as chewing, digging, or licking.
Boxers have earned a slight reputation of being "headstrong," which can be related to inappropriate obedience training.
Owing to their intelligence and working breed characteristics, training based on corrections often has limited usefulness.
Boxers, like other animals, typically respond better to positive reinforcement techniques such as clicker training, an approach based on operant conditioning and behaviorism, which offers the dog an opportunity to think independently and to problem-solve.
Stanley Coren's survey of obedience trainers, summarized in his book "The Intelligence of Dogs", ranked Boxers at #48 – average working/obedience intelligence.
Many who have worked with Boxers disagree quite strongly with Coren's survey results, and maintain that a skilled trainer who uses reward-based methods will find Boxers have far above-average intelligence and working ability.
The Boxer by nature is not an aggressive or vicious breed.
It is an instinctive guardian and can become very attached to its family.
Like all dogs, it requires proper socialization.
Boxers are generally patient with smaller dogs and puppies, but difficulties with larger adult dogs, especially those of the same sex, may occur.
Boxers are generally more comfortable with companionship, in either human or canine form. 
There are various organizations and websites, that rank boxers in both weight class and pound-for-pound manner.
 BoxRec (ratings)
 The Ring (ratings)
 ESPN (ratings)
 Transnational Boxing Rankings Board (Ratings)