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A cohort can be a generic mount (if they are of a size and shape that you can ride), but can not be a class feature mount.
You can not stack cohort powers on top of cavaliers' mount powers, though you are welcome to have one of each.
What Mighty Squash said seems to apply. You can have a class mount and a cohort mount at the same time, but you can't have a cohort mount with Animal Companion-style advancement.
Are you referring to using Leadership to gain a cohort and choosing to take a monstrous cohort which you then use a mount?
If so, then no. Absolutely not. You do not then add on class features abilities such as a druid's animal companion, a cavalier's mount, or a paladin's bonded companion. They are all separate abilities.
However, if you did choose a creature who's CR was not at the maximum of what you were allowed, you are allowed to add class levels to it until it reaches the proper CR. See this page for further details.
Anything you can ride can be a mount. Normal people have normal horses as mounts, but that doesn't make them animal companion, or the Mount class feature from cavaliers.
So, couple things:
1) The only dragon cohorts available are young dragons
2)Young dragons are medium sized. Meaning, you would need to be either small or take undersized mount feat to ride a young dragon.
3) Different colors of young dragons have different CR ratings.
For instance a young black dragon is a CR 7 normally, a young blue dragon is a CR 9 normally, a young green dragon is a CR 8 normally, and a young red dragon is a CR 10 normally.
The note that a young dragon's effective cohort level is CR + 8 means exactly that. In order to have a young black dragon as a cohort, it would be an effective cohort level of 15. Meaning you would need to be 17th level (as cohorts cap at two levels below character level per leadership feat) to attractive such a cohort.
Ultimately, you're not really going to be able to get a dragon mount. I mean, you can, but it's going to be at such a late level it's probably not worth it.
ok a question the dragon mount = CR+8 does it means if i use a dragon as mount if the cr i get is 14, the dragon i get is cr 6?
If what you are trying to say is "If I am at least a 16th level character with a leadership score high enough to gain a 14th level cohort (maximum for a 16th level character) can that cohort be a CR 6 dragon (equivalent of a 14th level cohort)?" Then the answer would be yes. If that CR6 dragon was of Large size, then yes, you can ride him/her. But you can't have that cohort be your Animal Companion, Cavalier Mount, or Paladin Bond. Those are separate abilities and apply to separate creatures.
The CR6 dragon cohort would exactly that, a CR6 dragon.
For what it's worth, the lowest CR young dragon you could get is a white young dragon, which is a CR 6, which you could get at level 16.
But, unless you're small or have undersized mount, you can't ride it.