When people talk about adopting a dog, most assume that they intend to get a puppy. And while the idea of raising a cute, tiny, silly puppy is pleasant, there are a lot of aspects of raising a puppy that can be downright draining.Senior dogs, on the other hand, are not most people’s first choice when it comes to adoption. However, what most people are forgetting is that senior dogs have a ton of benefits! Here are some of the big ones.1. You Know What You Are Getting Photos courtesy of Daily MailAdopting a puppy is a serious roll of the dice. Unless you are certain about the breed, there is no surefire way to know exactly how big they will get, or what kind of temperament they will have. With a senior dog, on the other hand, you know exactly what you are getting. They are done growing and have developed their personality, so you don't have to worry about them turning into some hulking beast that takes up half of your sofa. 2. Puppies Turn Into Adult Dogs - Fast!Newborns are cute. That is a fact. Babies, Puppies, Kittens, Calves, Fawns - all newborns are adorable. However, nothing stays a baby forever. And, before you know it, your precious little puppy has grown into an adult dog. Just take a look at this video and see how long it takes for these puppies to grow up.