Breeding don't work

[LUC1G07CH1]

I tried to breed 2 pets on my site but the site says that my pets belongs to an unbreedable species. But...all species are breedable!

And how we choose images to the cubs?

And something like this?
Default pet x Default pet=Default Pet
Default pet x Other pet=Color/mutation combo
Other pet x Other pet=Color/mutation combo
Same pet x Same pet=Same pet

I just cannot understand the things...

Edit: I tried to breed 2 different pets,but it just comes out like the default breeding setting. How we fix that?
Another edit: Nevermind,i need to put the female and male pets for breeding,and then,invert the form. Easy but takes awile.

[tahbikat]

Both pets must have the same breeding class in order to breed. You assign breeding classes when you first make the pet. So for example, all pets with "Small" for their breeding class can breed with one another.

To get different types of pets out of breeding, go to your breeding settings in your ACP and enable Advanced breeding. Make the breed adopt like you would a normal creature, but select "available from promo code use only" option when you get to the availability section. Then create the new type of pet by going under your Breeding tab and clicking the "Create New Breed Adopt".

[LUC1G07CH1]

What do you mean by "same breeding class"?
I used the exact same pet but nothing works.

Edit: Nevermind! I just put the species to an unbreedable species section,i removed them and the cubs just came out,everything right.

Well...The breeding worked,but bthe color/mutation combo not. What i need to do to not appears their types,but the hybrids? I clicked on Advanced and nothing happenend.