Analysis of Evidence 2: To put differently, animals are different in many ways from humans. Chocolate, grapes, raisins, avocados and macadamia nuts are harmless to people but toxic to dogs. There are so many other differences. Such as the fact that animals do not get many of the diseases we do, such as Parkinson's disease, major types of heart disease, major types of cancer, Alzheimer's disease, HIV, etc. It is important to take this information into consideration when thinking about whether or not animal testing is actually beneficial.