Police are searching for the owner and the dog which injured a woman and her dog at the Birchwood Nature Park in Lincoln on Sunday, March 23.
A 62-year-old woman, who has not been named, was walking her dog through the nature reserve at around 10.30am when a white Bull Terrier-type dog approached her without a collar.
The dog turned on the woman and her pet. She suffered injuries to her hand and her dog had injuries to its face and was taken to the vet.
People nearby came to help her and the Bull Terrier-type dog was last seen to run into the woods.
The dog and its owner are yet to be traced.
Anyone who knows of a similar dog that frequents the area of the nature reserve is being asked to contact Lincolnshire Police on the 101 number quoting reference number 215 of March 23.
The incident comes weeks after two women were attacked by dogs in Lincoln.
As previously reported, a Lincoln woman suffered life-changing injuries to her face when a Pitbull-type dog attacked her.
Some 12 hours after this, another woman suffered a suspected broken arm when she was bitten by a Staffordshire Bull Terrier.