Dog calls, like buses, all come at once

Why do you have 2 and a half weeks of silence then get 6 black lab phone calls in a 30 hour period in 1) south of Newbold (Rocky again) Fri morning 2) Arnold's Cres Newbold Fri morning (2 miles north of (1), definitely different dog but unaccounted for - thanks to Geoff for scrambling) 3) Barlestone outside the Co-op Fri evening (sniffed the lady's shopping, she thinks too dark to see scar, we think she would have, described as very thin with loose collar). Wearing a collar so not George our well known wandering Sky impersonator in Barlestone!
Meanwhile back on the Twycross trail, the massive effort today by Tim, Tori and Rachel is paying off. There is definitely a black lab on the loose. Tuesday afternoon he was seen halfway to Sheepy Magna. A man working outside his house heard a car door shut and a car drive off on a very quiet road, which is unusual, so looked up and saw a black lab barking at the car and then ran off. Described as average build; healthy. Not close enough to see scar and not sure about collar. He rang as soon as Rachel put the leaflet through the door.
On same lane Thurs evening, just before the lady who called us on Thurs saw him, another young woman driving home from work saw him in almost the same spot, slowed down, he looked at her, she had 2 cars pull up behind and there was nowhere to pull in, so had to drive on. She told her dad as she wanted to go back, and he called us today as soon as Tori put a leaflet through the door!
Definitely the same dog but she said he certainly wasn't thin. However she's adamant that it's Sky from looking at the leaflet. Describes a dark collar and metal tag dangling.
Does he look bigger because he has a thick coat and has a good food source?
Was the dog dumped out of the car on Tuesday or did the car stop to try and catch him?
Is it Henry the mild mannered janitor............? (sorry getting carried away now)