Adopting a dog into your life and home is one of the greatest things a person can do, not just for the dog but for themselves as well. Made up of endless amounts of love, owning a dog is like having constant access to your best friend in the world. No matter what kind of day you’ve had or what’s on your mind, if you’ve got a dog that loves you then you can rest assured that the weight of the world will suddenly drop from your shoulders the moment you walk in your house to be greeted by your four-legged bestie.

For a lot of first-time doggy adopters, there is a good deal of research that goes into picking out your best forever friend. What kind of dogs are good for families? Will my house and my daily life suit their needs? Are they costly to take care of? The list of questions when narrowing down your choices to the perfect furbaby can literally just go on an on.

Regardless of how much effort you pour into your search for answers, though, there are a plethora of other factors that can influence just exactly how your dog will turn out to be, especially regarding their growth. You might THINK that you adopted a medium-sized dog that prefers to run around and play more than he likes to snooze on the couch and cuddle but, sure enough, and all too often, it doesn’t turn out that way. Here are 25+ examples of times that people thought they were adopting a dog only to end up with a small house bear!