I'm sad my Shiba is growing up

For the record, she is only 18 months. But she has really matured over the past couple months.

She is biting less, chewing things less, getting into things less. She used to do this cute whimper, panic thing when she would get a tasty treat and now she just enjoys it. (Not bad, but damn it was cute.) She sleeps more and seems to have outgrown some of her favorite toys. She is turning into a really amazing dog, but I'm still a little sad that her puppy-isms are going away. My fiance is happy about it, because, well, she was a little terror, but I didn't mind because she was just a puppy.

She will always be my baby, no matter her age, but I'm sad she is aging, even if it means she is more well behaved.