One of our dogs growing up (golden retriever), would run laps around the house for hours. He would also play fetch, but he would bring a ball back within about 20 feet of you before dancing around in a circle. The only way to get him to drop the ball was to have a second ball ready to go when he got back wit the first one. He would also try to fit as many tennis balls in his mouth as possible, saw him get 3 in successfully once. He was also terrified of floor vents and the downstairs bathroom. He loved to carry socks around, the dirtier the better. He never chewed them, just carried them around in his mouth.
Loved that derpy dog.
Looking back, there were definite jumps between generations, but at the time it definitely felt gradual after xbox->360/PS2->PS3. The jump to Xbox/PS2 was incredible at the time