Another dog needing a lot of time and patience to train is the Affenpinscher, a very mischievous dog indeed. Although they are very amusing to watch and be around, but they can be quite worrying if you are a parent. Affenpinschers are very small, and so children can often mistake them as toys and mishandle them. The Affenpinscher tries to defend itself, which can lead to some aggressive behaviour. They can be trained well, but it takes a lot of patience to do so.