They can be trained to do many things. But they probably don't have complex thoughts. USA I think even though people think some pets are stupid, pets probably think complex thoughts but don't express them. USA Some animals do think complex thoughts. For example, wolves can decide today that they need to hunt for food tomorrow.
Some apes do, too, like chimpanzees.
They have regular meal times, for example. Actually, after thinking about it, I'm not sure whether animals do think complex thoughts. USA I believe animals think because our neighbor's dog knows us and always likes to see us. Dogs are smarter than other animals. Our hermit crab only thinks about survival.