A/N: I liked writing this one.

Disclaimer: Is Castle married to Beckett? Do they have two kids and a dog? Are you watching this on tv, or reading it as the script for an episode?

If the answer to any of the above questions was no, then this is not ABC's Castle. This is my fanfiction.

I told you a dog was a good idea

Richard Castle was grinning in the sunshine, whilst playing catch with his son and his dog. The whole family was in Central Park, enjoying one of those rare days when Kate had a day off and the sun was shining.

Soon enough, J.J. bored of the game of catch, and ran off to the playpark, to be with some of his friends that he had spotted. Castle waved across the park to where Kate was watching Hannah from a bench, and clipped Rufus's leash to his collar.

"C'mon Rufus" Castle said to the dog that was now nearly as tall as his son. "We're going for a walk"

It was only a few minutes later when Castle heard a sound.

This sound spoke to the very depths and the oldest parts of Castle's soul. And the words is spoke awoke pure fury in the mind of the normally cheerful man.

The words were from a voice he recognised as Johanna Martha Castle, aged 5.

There were only 3 words.

"DADDY! HELP ME!"

"Rufus!" Castle said un-clipping the dog's leash "Find Hannah!"

There was a short growl from the dog, before a huge bark, and Rufus charged away, towards Hannah's voice, barking loudly all the way. Castle chased after the dog, running as fast as he could.

He got to the edge of the park to see a struggling Hannah being pulled towards a black van.

He then saw Rufus, almost upon the man dragging Hannah. Rufus, now about as tall as Castle's 5 year old daughter, was a very large dog, and very heavy. Rufus didn't stop. Instead, Rufus jumped, and hit the man in the back, bowling him to the ground. Castle kept on running, seeing Hannah break loose from the man's grip as he fell. Castle ran forward, and snatched Hannah up.

Seeing the van roar away into the traffic, he swore. No license plates. Then seeing that Rufus had the attempted kidnapper pinned to the ground, he pulled out his phone, and speed-dialed Chief of Police, Montgomery.

"I know Castle, Ryan and Esposito are already on the way, with some uniforms."

"I've got one of them!" Castle interrupted. "Or more accurately, my dog does. I wasn't able to get a license plate.

"Good, that should make it easier. I'll meet you at the 12th, okay?"

"Okay" Castle said hanging up, and cuddling his daughter, as Rufus continued to snarl in the face of the attempted kidnapper, but not bite, Castle noticed, proud of the dog. The guy might have a few scrapes and bruises, and maybe a few cracked ribs, but no big.

Almost at the same time, his trained ear caught sirens, and judged them at about two minutes away, and his heavily pregnant wife walked over to him, with their son, J.J. in tow. Judging that Rufus had the suspect secured for the moment, Castle ran over to his wife carrying their daughter.

"I know you Kate, give me the cuffs."

Castle got them, and went and cuffed the man's hands behind his back, before pulling Rufus off the man. At that point, Ryan and Esposito pulled up, along with a half dozen uniforms.

A/N: There may or may not be more in this line at some point. Read, review, but most importantly, enjoy