Reports of horses and hounds from a hunt causing problems on a road near Sherborne are being investigated.
It happened on Saturday on the A352.
Dorset Police have urged people not to speculate about what happened on social media.
They want to hear from anyone with dashcam footage.
Inspector Simon Perry, of North Dorset police, said: "We are carrying out a proportionate and objective investigation into these reports and I am appealing for any witnesses who have not already spoken to police to contact us.
"While I understand there can be strong opinions surrounding issues relating to hunting, I would like to remind members of the public that this matter is now subject to an investigation.
"I would therefore urge people to exercise caution and refrain from making any comments, particularly on social media, that could prejudice or undermine this ongoing investigation.
"I would also encourage anyone with any video footage in relation to this matter to contact police rather than post it on social media as it could form evidence as part of the case.
"Anyone with information is asked to contact Dorset Police at www.dorset.police.uk, via email email@example.com or by calling 101, quoting occurrence number 55190161246. Alternatively, contact Crimestoppers anonymously on 0800 555 111 or via www.crimestoppers-uk.org."