In the following question below are given some statements followed by some conclusions. Taking the given statements to be true even if they seem to be at variance from commonly known facts, read all the conclusions and then decide which of the given conclusion logically follows the given statements.

Statements:  

Some cats are dogs.

No cat is cow.

All cats are bull.

Conclusions: 

I) Some cows are not dog.

II) Some dogs are not cow.

III) Some cows are not bull.

IV) Some bulls are not cow.