The Sleipner.
A Sleipnir is an 8-legged mythical magic horse.
Just age your horse to twenty months or 1 year 8 months
There are no such thing as 4 legged spiders. If there were any, then they wouldn't be called a spider! A spider has 8 legs. :)
click the ultrasound button under reproduction when you are visiting your pregnant horse
You can age the horse with ageing points - click "age my horse" to the middle left of your horse's page and age him 2 months without waiting. Or, you can simply wait until the next day when the horse will have aged naturally.
Yes. If the horse is 6 months into her gestation period and you age her with an aging point, she will be 8 months into her gestation period.
You cannot make your horse a Sleipnir, they are divine horses with 8 legs and you must buy them as there is no longer the promo where you can win them.
It takes 8 months so 4 days or just use aging points
You can have an ultrasound at 6 - 8 months, but they are not worth it in all honesty. Better to save your equus for the birthing cost.
spider
Youtube is your best bet.
Press the "info" button (Magnifying Glass) on your "Reproduction" tab and it should say "Gestation: 8 months, 6 months, etc...