You can set a canonical URL:
<link rel="canonical" href="https://www.amaoni.de/shop/hundebetten" />
which will tell search engines that those pages are copies of each other (just with different filters).
You can also tell Google, via Webmaster tools, which URL parameters to ignore (your filters). See this Help Centre article: https://support.google.com/webmasters/answer/6080548?hl=en