Animal experiment

I like animal especially dog. When i was in elementary school, I had pet dog. I think many scientists like pet. But, in the laboratory, they also have animal experiment. Animal experiment is always arguing with scientists and animal protecter. Usally, people think that is scientists's fault. And people states that stop the animal experiment. I disagree with this idea. I think animal experiment is necessary for human.
In the past the most famouse dictactor is Hitler who had human experiment in his colony. It is incredible disgusting events. But many researcher states after that events, there was amazing improvement in medical field. This is accepted fact. Now, we have high technology in medical field, we need not to human experiment anymore. Instead of it, we can do animal experiment.
For example, we can know side effect before producing new medicine. It is very important thing. If there is no animal experiment, people could die with unwaring side effect. On the other side, one case which is issued on news nowadays, the cause of pregnant woman's sudden death is turned out by mouse experiment. Animal can do instead of people. Appreciate and sorry about that, but it should be keep going.