Here's why:
* Different species: Goats and sheep are different species, even though they are both part of the same family (Bovidae). They have a different number of chromosomes and other genetic differences that make it impossible for them to breed naturally.
* Ethical considerations: Even if it were possible to create a goat-sheep hybrid through artificial insemination, it would be considered unethical due to the potential for suffering and the fact that it would be unnatural.
There are many fantastic pictures of goats and sheep individually, and you can find some very interesting images of different breeds.