Xenomorph that attacked Wendy

I don't think it was from an animal as we saw that chest exit wound from a human in the cryo pod. However it moves similarly to the runner from A3 and that one burst out of a dog (or an ox depending on which version you watched) 

That orange cat we saw in episode 1 was merely fan service and a throwback to the OG orange cat Jonesy from the first Alien.