This news comes just two days after @[email protected] asked Is it generally safe to walk through a field of cows? on [email protected]. To cite a response from the thread:

Usually it’s pretty safe except when there are calves on the field. It happens every year that some tourists (especially with dogs) go through a field with calves and their mothers and someone gets injured. - @[email protected]

This comment is backed up by a statement from the linked article:

Emergency service personnel cited by Austrian media warned of the danger of dogs getting near cows. “Cows have a very strongly developed maternal instinct and defend their calves,” said an emergency service source cited by news agency APA.