Does The Dog Die?
Here’s a site that aims to address a single specific need. Does The Dog Die? helps helps viewers avoid (presumably) distressing pet violence in their film diet. While it’s far from exhaustive, it lists a number of films, and codes them as follows
The site is simply an alphabetic list of titles, each coded with the appropriate legend.
Clicking in to a title gives slightly more detail – “an explanation which will only contain spoilers relevant to the fate of pets (and occasionally other animal characters) in the film.”