Irish people love to raising sheep.
Love to do sth.
Irish people love to raise sheep.

Shepherd specially raising sheep.
{Shepherd} is a countable noun, so please use the plural form here.
And the tense is simple present, so the verb should use the original form.
Shepherds specially raise sheep.

Sheep has white fur.
{Sheep} can be singular and plural.
We can use {sheep} as plural or {a sheep} as singular.
A sheep has white fur.
Sheep have white fur.

Sheep likes to ate grass.
The same problem mentioned above.
Like to do sth. Use the original form after {to} here.
Sheep like to eat grass.