Responsible Pet Owner?

Until this past weekend I thought I was a responsible pet owner. I have spayed and neutered all of my animals and kept them up to date on all of their shots. My two dogs had id tags on their collars and I taught them how to behave well and follow the basic commands. Since they behave so well I think I took for granted the fact they are still dogs and given the chance will behave like dogs.
Saturday night I was working outside on the car while Riley and Grace were out there with me. Most of the time they stay right in the yard and they did so for a while until the call of the wild beckoned them to wander, and wander they did. The pair of them left the yard around 930pm Saturday night and were gone. I figured they would be back soon and waited up for them until midnight and with no response to my calls, I go to bed thinking I would wake up to find dogs who were sad because they had to spend the night outside. Five am, wake up, go to front door and whistle. No dogs. 6am same drill and still no dogs. Drive through neighborhood calling for them before church and see no sign of them. I hope they are still running together so at least they have each other.
At one time both dogs had ID tags on their collars but now that they are out on their own neither one of them is wearing id. Gracie while playing with Riley pulled his tag off some time ago and Gracie recently lost her id tag some where in the back yard. A responsible pet owner would have replaced the tags as soon as they were discovered missing. If I had spent a few dollars at any pet store I probably would have had a call from several people who responded to flyers I past out in the neighborhood saying they saw them running together.
Monday morning, I was passing out a few of the remaining flyers to local veterinarian hospitals when I found Gracie. She had been hit by a car and a good Samaritan found her laying by the road and brought her in. Gracie does not have any broken bones but has a bad concussion and bloody nose. The doctor gave her medicine to keep the swelling in her brain down and to treat the pain and she spent the night there under observation.
I went to the place where Gracie was found and Riley was still there. The woman who found Gracie said it was Riley who alerted her to the spot where Gracie was laying. She said Riley kept looking toward Gracie and she saw Riley go over and lick her as to say Hang in there, help is on the way.
The morale of the story? You never expect your pets to run off but if they do, make sure you have an id tag on them. If I had id on my dogs, I would have been able to save hours of agony and a trip to the veterinarian hospital.