Answer:
The dog is 20 inches tall now.
Explanation:
Given that:
Height of dog when it was a puppy =
inches
Height of dos now =
than previous height
It means that we will add this height in the height of dog when it was a puppy.
Height of dog now =

Height of dog =

Height of dog = 20 inches
Hence,
The dog is 20 inches tall now.