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Hi this is Dr. Hill. It sounds like a mite on your bird. You will need to take Petie to a veterinarian to get an accurate weight and treatment prescribed. There is really no homeopathic remedy for this. Unusual that the dog and cat are also affected. Makes it unlikely to be lice, because they are typically species specific. When you smashed the bug, was their any blood? Please ask any follow up questions. You can continue posting on this thread for a couple of days, even after rating my response. Take care