Arthur was laughing, laughing so hard that he had collapsed onto the floor. Wiping tears from his eyes he looked up at Merlin and cracked up into more laughter because somehow, although he didn't know how, his manservant/friend had managed to turn himself into a small, black, bear-like puppy. "Merlin, care to explain?" the prince asked once he had himself under some semblance of control. Merlin huffed and lifted his shoulders which Arthur supposed counted as some sort of dog shrug.
"I thought you said you were going to create a dog, not turn yourself into one?" said dog growled quietly and lay down; resting his head on his fluffy paws. Arthur sighed and decided to shuffle over to Merlin's side and began to gently stroke the soft fur on his back. "What's the plan then?" he asked the small puppy who looked up at him with watery blue eyes.
"You know i could get used to this!" puppy-Merlin's head tilted as in to ask 'get used to what?'
"You being not able to talk!" he said and started laughing once again as Merlin crawled under his bed and refused to come out.
(By the way just to give your imagination a bit of help the dog i cast Merlin's transformation after is a Newfoundland puppy. They are just so cute!)