What are the effects of nuclear explosion on animal?

About the same as the effects on man.

That is why pigs dressed in customized military uniforms were common effects test subjects at the Nevada Test Site. In one test shot a group of such pigs were placed behind a glass picture window. When the blast wave shattered the glass it solved the one remaining test requirement that nobody had been able to implement before the test, the pigs were to be standing on 2 legs like men. Startled in pain as hundreds of glass shards from the window was driven into each of their bodies, they all stood up on their hind legs!