Breeding has a cooldown of 7 days.
Bred eggs, unlike the eggs taken from the biomes, can be abandoned immediately instead of having to wait 5 hours. If an egg is bred but the user is on scroll lock (when the scroll can no longer hold any eggs/hatchlings) the egg is auto-abandoned.
A list of an individual dragon's children can be found on your dragon's profile page.
Breeding is an action that is given only to adult dragons with some exceptions: some dragons can only breed with mates of their same kind (like Drakes, Two-Headeds and Pygmies) and others can't breed at all (like Cheeses, Papers, Guardians of Nature, Neglecteds, Undeads and Vampires).
Previously, breeding two rare dragons would always result in a refusal, but as of June 10th, 2011 they are able to breed together, with the chance of producing a rare egg the same as when breeding a RarexCommon pair.
Message received and explanation
"The dragons refuse to even go near each other."
This means that the two dragons you tried to breed will never breed with each other. It can happen between dragons of any rarity. Breeding Holiday x Holiday or Retired x Holiday any time besides at least one of the Holiday's breeding season will result in a refusal. (Ex: Christmas x Halloween during the Valentine's breeding season, Frill x Valentine at anytime besides the Valentine's breeding season)
Currently, once a pair of dragons has refused, the refused partner is moved to the bottom of the list of possible mates and is not available to attempt breeding in the future.
"The dragons don't really show much interest in each other."
This means that the two dragons don't want to breed at the time but are capable of doing so in a future attempt. Once a pair of dragons had no interest, the partner is moved to the top of the list of possible mates.
"You attempt to breed the two dragons, but no egg is produced."
This means that the dragons bred successfully but no egg was produced. Once a pair of dragons bred no eggs, the partner is moved to the top of the list of possible mates.
"The dragons breed and produce an egg."
This means they have successfully produced an egg. Once a pair of dragons bred an egg, the partner is moved to the top of the list of possible mates.
The Geode Dragon can only be made by pairing the following:
The Hellhorse Dragon can only be made by pairing the following:
The Shallow Water Dragon can only be made from the following:
The Soulpeace Dragon can only be made from the following:
Striped Dragons (different colored versions)
The different colored versions of the white striped dragon can only be obtained by pairing the following:
The Two-Finned Bluna can only be made from the following:
The Ultraviolet Dragon can only be made by pairing the following:
Once you have found two matching dragons and bred them, they may produce an egg. This egg could be the breed of the father or the mother. If either parent is a Holiday Dragon, the egg will only end up as such on said parent's holiday. Otherwise, it will be the breed of the other parent.
The only exception to the one-egg rule occurs during special Holiday Dragon breeding periods, in which clutches of multiple Holiday eggs may be produced.
The chances of a successful breeding are not affected by how many eggs are in the abandoned page, which is a common myth.