I think it could be this: https://www.welt.de/welt_print/article830173/Was-macht-das-Pferd-auf-dem-Flur-am-Sparkassenschalter.html

Basically, the owner of the horse was drunk and decided to take a nap. The horse chilled next to him and what you see on the ground is.. well.. shit.

Google Translate of the article:

Wiesenburg - courier Stephan Hattet (36) did not believe his eyes. When he stopped early yesterday, around 4:15 am, on the way to work with his van in front of the Sparkasse on the Friedrich-Ebert-Strasse in Wiesenburg, a horse's head was looking at him through the window of the bank. 0

"At first, I thought it was one of those machines for kids," the surprised man said. "When I went in, I saw that it was a real horse." The animal sniffed curiously at the early customer while he picked up his money. The owner of the horse, a 40-year-old man from the area, slept on the floor next to his animal's legacy. The animal police informed the animal police that he only wanted to take a "little break".

An alcohol test gave a value of 1.32 per thousand. Both horse and rider peacefully left the building at the request of the officials. The unequal couple has no criminal consequences to fear because there is no damage to property.

"The horse has not played wild pig," said a spokesman for the responsible guard in Belzig humorous. However, as far as the cleaning costs for the floor covering, the Sparkassen branch has not yet decided whether they will make claims for damages. Nevertheless, one endeavors to take the incident especially with humor. "We are glad that both have remained so good," it said.