Rosemarie Grose, 67, is given a 12-month conditional discharge and ordered to pay compensation.
The victim suffered 'ABH-level injuries' in the attack in Staines last month, say police.
Marie Vickers suffered severe injuries when she fell from her horse after it was chased by a dog.
Three dogs were allegedly "out of control" in the Newton Heath area of Manchester, police say.
It comes as the only insurer providing cover for XL bully-type dogs decided to stop providing cover.
Police are reminding dog owners of their responsibilities after at least 35 sheep are killed.
The animal, believed to be a bull terrier and Doberman cross, has been seized, police say.
At least 35 sheep have been killed and dozens more injured in the spate of Devon attacks.
Malvern Hills Trust said three sheep had been killed and six others attacked in 2026.
