Actually, you're wrong. A sheep doesn't remain a sheep and a goat doesn't remain a goat when a ram and a doe interbreed and produces an offspring that is still fertile.Bears remain bears, white or brown, sheep remain sheep, etc. and otherwise. (Viruses remain viruses, etc.)
Don't forget, the bible strictly differentiate the SHEEP KIND from the GOAT KIND. And sorry, but trying to use the excuse that they are both part of the LIVESTOCK KIND, won't work here since neither a sheep nor a goat can multiply(interbreed) with cattles or pigs.