I don't think there is anything you can do, the nails will pass through the digestive system, there is a risk of cuts and abrasions and of course infections, call the vet :P
two
plenty of mares get pregnant that young. the foal should be fine and so should your mare
you need to give the mare a rhino shot in the 3rd, 6th and 9th months of pregnancy
for Howrse, it's 3
It means that the mare is pregnant.
From a stud.
The diet of a pregnant horse does not really change with the breed. The only exception is if the mare was / is a hard keeper and will need even more food than normal. A pregnant mare should have all of the high quality hay she can and will eat. In the last trimester or so of pregnancy, she should likely have a supplemental feed of hard feeds such as a mare and foal ration.
Horses are pregnant for eleven months, so your horse should be due around June.
horses never get pregnant, its the mare who gets pregnant.
No.
A mare should have all of her regular vaccinations and possibly a booster in her 9th month.
It could! Breeding really needs to be supervised. The stallion could enter the wrong way and that alone could kill your mare. Also be very sure she is pregnant, it's odd that your stallion would get so worked up over a mare that should be pregnant.