My boys, Buster, the white schnauzer mix is a year old. He lives to stick his nose in the ground and pull out a shallow growing root about a foot long or catch a grasshopper and "play" with it forever. He's a very good watch dog, he can hear a fly sneeze. And he's very attentive to the human side. Since my mom passed away recently, if Buster hears me crying, here he comes. He has to be right up on top of me and in my face, licking, wagging, looking. He has expressive inquiring eyes that will not be easily dismissed.
Cappuccino, on the other hand, couldn't care less. He's about 11 years old, still very able to leap tall buildings or at least onto the bench and then onto the bed. He really hasn't slowed down, but he's just not impressed easily. He was my daughter's dog, but she couldn't take him when she moved to Tennesse, so we were stuck with each other. But he's more like me than I care to admit. He's content to sit on the couch and watch TV or sit on the porch rather than romp around in the yard with Buster. If he sees me crying instead of like Buster, Cappuccino will raise his head and look at me like "Oh, brother, are you crying again?" and then put his head back down. He lays at the end of the sofa with his head hanging off the edge, crazy.
The only time he gets stirred up is when the Blue Heelers from hell come into the yard then Cappy acts like he's King Kong. Really, he starts wiping or scrapping his paws on the ground in a straight line ( I read where this has to do with releasing the scent from sweat glands in their paws to attract other dogs) and then he'll make this gruff barking sound, very lionly. But he's half the size of these other dogs. They have never got into it with him. He can definitely hold his own ground.
Cappy was stolen from us when he was about 18months old, he was gone for almost 9 months. I thought coyote had got him, but one day when I went to pickup my other dog, since deceased, at the groomers, I saw Cappuccino in one of the back cages. When I asked the owner if that dogs name was Cappy she told me his name was Cap. I restrained and composed myself and told her his real name is Cappuccino and he was my dog and had been stolen.I waited for the owner to come. She had purchased him about 6 months prior and had no idea he had been stolen. She let me buy him back from her (plus the cost of the grooming).
Long story short, dogs are great companions and definitely have their own personalities. I don't know if they start to take after their owners or vice verca.