I get it, puppies are cute. But having just come out of fostering a puppy I tell you that I will take this 6 year old gem of a shiba over the cutest of puppies, any day. That cute and sweet adorable puppy did more damage in three days than any of the adult fosters I've had have done ever - combined. And as much as I love paying to get my carpets cleaned...well, you get the point, lol.
However, these adult dogs have an amazing amount of love to give and they deserve to have a home and a family of their own to share it with. Some of these "adult dogs" we take in are just learning how to live life. My very first foster was a six year old mill release who had never even gone for a walk. Watching him play with a toy for the first time and experience that glorious "squeak" each time he killed it remains to be one of the highlights of my rescue experience. At that moment, he was not an "adult dog", he was a ten week old puppy who was just learning to play and he was loving it. Four years later dog is still going for 2-3 long walks/day, he is healthy, happy, and still ripping squeakers out of toys. He gets to sit on the couch and snuggle with his sister shiba. He is loved, and he gives great love in return.
As a foster home, and an MSIR adopter, I encourage people to consider giving these older dogs a shot. We love our own adult dogs, but I also look at Kenji and think that he is everything we want in a dog. In all honesty, if we could have a third dog he may not be up for grabs. He is healthy, he is sweet, he is kind, and most importantly, he'll happily snuggle on the couch with my toddler. He'll "play" trains with her (ie lay on the floor with her while she plays trains and not chew up Thomas when she puts it in front of him), he'll sleep with her, he'll be her friend - her dog. Something she wants so badly from our other dogs. But, we got them as young dogs and we didn't know that they would tolerate, but not necessarily love our future kids. We wouldn't trade them in for anything, but it gives us something to think about for the future.
Adult dogs are not necessarily set in their ways, but their temparments are more predicatable and they become more reliable. This is not a bad thing especially when considering adding a new dog to an existing household. Of course adding a dog to your family is a personal decision, and it is not up to me or anyone else to decide which dog is right for you. But I just ask you to think about this, and consider them.