Affenpinschers have been referenced since the early 1600s. They were slightly larger then, about 12" to 13", in gray, black, tan, black/tan, gray/tan, and sometimes redish. White boots and white chest were common as well.
These dogs were primarily Ratters or Ratting Terriers and were simply the farm or store dog, running free for the most part, and housed in the stables.
These little dogs are very active, but they easily adapt to indoor living conditions. Due to their size, they are ideal for apartment living, and also make nice companions for the elderly.
Fresh food is always preferred, fresh meats, veggies, and occasionally fruits. If you plan to use commercial dog food, please do the research. Make sure that all the ingredients have passed USDA inspection, that the first two ingredients are pure meat. Check that there are no corn, soybeans, byproducts/animal digest, artificial preservatives, or fillers such as brewer's rice, rice flour, and beet pulp.
Patience and persistence are needed in grooming the "Affen" - affenpinscher.org offers a wonderful Adobe file HERE which details their grooming step-by-step.
Affenpinschers are rambunctious and are prone to fighting with other dogs. This can lead to all the normal injuries you would associate with a dog fight. Another thing to watch for is what's called subluxated patella, or slipped stifle which can cause them to have a hitch or pronounced limp. To avoid this, it's best to teach your pup not to jump up on people or furniture. If they are allowed on furniture at all, rugs should be placed on the floors near the foot of chairs and sofas. This will help reduce the chance of slipping and falling if they attempt to jump down.
"Affens" have large eyes which are susceptible to scratches and possibly even ulcers. They may be prone to fungal infections in and around the wrinkle between their eyes and nose, so try to pay close attention and check these areas regularly.