By eHow Pets Editor
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Part of taking care of your pet is knowing if it is feeling well. With most animals this is relatively simple since they have physiology somewhat similar to a human. This isn't so with insects. Various species of insects can get different maladies. Most commonly, parasitic nematodes infect pets and cause distress in the alimentary, circulatory, excretory or other systems. After getting to know your pet, there are some rules of thumb for identifying behavior that is not standard.