Do some animals come from different planets?

Well, yes and no. Saying this because there really isn't enough evidence to tell that some animals DID come from other planets. The other planets in our solar system really aren't good enough to support life. In terms of temperature, gases, food and beverage supplies, etc. Though we have some evidence that shows quite a while ago that an asteroid with lots of potentially "extraterrestrial" bacteria were existent and that they came from other creatures. However, since there are bacteria that don't come from living things on Earth, we don't have enough evidence to support the idea that this bacteria came from other living organisms.