Officers are appealing for information and witnesses following an alleged incident in Hemel Hempstead.
Between 11.30am and midday on Tuesday, July 14, two men were involved in a verbal argument in Leverstock Green Road, close to the Crabtree Pub (pictured).
At the time, they were both parked up in recovery vehicles.
During the altercation, the suspect allegedly exited his vehicle and made threats.
He was then reported to have punched the victim along with the victim’s driver’s side window.
This caused it to smash over the victim and his dog.
The victim drove away but the suspect is said to have then got back in his vehicle and followed, swerving in and out of lanes, before driving off at the bottom of Midland Road.
Detective Constable Fenton Robinson, who is investigating, said: “I am appealing for anyone who saw what happened, or anyone with information, to get in touch.
“Were you in the area? Did you see the incident? Or did you see the build-up or aftermath?
“Any information you have, no matter how small it might seem, could be vital to our investigation. If you can help please call the non-emergency number 101 or email me at firstname.lastname@example.org quoting crime reference 41/55195/20.”