Yes they can, it is called In-Breeding, although many players do like and do not breed In-Bred horses, Non-inbred horses are called NIB's.
You breed to pure bred horses of the same breed, for example: breed 2 pure bred Mustangs. (it doesn't have to be Mustangs) and the baby will be a pure bred Mustang(:
They all come out roughly the same honestly. The higher the skills, GP, and training, the better the horse will do no matter what breed it is.
Yes, you can have over 4.000 horses if you want. When you first register on Howrse, you will get some easy quests to learn how to play Howrse, and when you have finished those quests, you will get a free horse of the same breed as your first horse.
Black is a color and not a breed. Appaloosa horses can be black.
If you mean the same breed, not always.
it is the nape! i play howrse! biggrape
an infection to the hoof same with the game test howrse
If you mean at the same time, then use the fertility wand for only one pass. But otherwise just breed to mares with PB thoroughbred stallions and then you have a great chance of getting 2 thoroughbred foals/fillies.
Usually. The breed in America is usually the American Mustang.
I would think that if they were closely related, they would at least be a cross of the same breed.
2 years 6 months. Same with mares.
When you breed together horses that both have very high genetic potential, then the GP of the foal will be higher than from lower GP parents. This is only the case if both parents have reached 100 BLUP however. All of the high genetic potential horses are inbred. The non inbred horses are mostly still under 400 GP.