When a pet is introduced into the family as a puppy or kitten it doesn't take long for them to become another member of the family. As each day passes the bond shared between a pet and their owner only grows stronger, but because you see them everyday you don't notice how quickly they grow up and change. Here are the 27 most adorable pictures of pets growing up.

1. Taken 14 years apart.

3. 4 years on and they've perfected this pose!

5. 5 months apart and he's almost outgrown the bed!