I am looking for the equivalent of the RSPCA in Belgium so that I can contact them when I see any animal suffering. Thank you.
Try Gaia - https://www.gaia.be/nl
or Animal Rights Belgium - https://www.animalrights.be/
There is no national system equivalent to the RSPCA which has a quasi governmental role and is recognized in law, with RSPCA inspectors having legal and enforceable rights.
There are a number of organisations like Gaia and Animal RIghts mentioned above, but also others such as the Croix Bleue https://www.croixbleue.be
However, typically your first point of call in Belgium would be your local commune or the local police. For example, if you live in Brussels, the commune has a dedicated page for how to report suffering of animals. You can report in-line, or in an emergency, it advises you to contact the police.
Wallonie has a similar page:
I assume Flanders has similar but I am not a Dutch speaker.
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