An 89-year-old man was bitten on the ear by a dog in Royston High Street.
The victim bent to stroke the dog at around 11.25am on Saturday, February 3, when it jumped up and bit his ear.
The dog's owner immediately assisted by taking the victim to a pharmacy, where an ambulance was called, but left the scene without giving any details before the police arrived.
Police are now appealing for witnesses and information in relation to the incident.
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PC Callum Grindley, who is investigating, said: "I’d like to hear from anyone who witnessed this incident or who has information about it to please get in touch.
"Please contact me with details by email via callum.grindley@herts.police.uk."
You can also report information online at herts.police.uk/report, speak to an operator in the Force Communications Room via the online web chat at herts.police.uk/contact or call the non-emergency number 101, quoting crime reference 41/9638/24.
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