Fish?
no
laoasasd
Their either Bites or Hives.
scabies
Itchy, watery bumps on the arms and legs could be due to an allergic reaction, insect bites, hives, or dermatitis. It is recommended to consult a healthcare professional for proper diagnosis and treatment.
Yes, I have personally experienced this one.
Bath to hot
It can be due to mites. They can be present on your bed.
could be just about anything. if it persists then see your doctor.
Yes
Possibly a vascular issue
You can simply let it pass or you can breed. It is good to clean your mare's legs, as when they are in heat their "discharge" can get on their legs, making their legs itchy and uncomfortable. If you find your horse moody when she is in season you can try different supplements specifically that are designed to help with the moodiness.