I've previously asked which are good documentaries about environmental impact of livestock industry. However, since I'm living in a Spanish-speaking country, I'm more interested in which documentaries have been made, or dubbed, in Spanish?
A Carne É Fraca (or La Carne Es Débil, "Meat is Weak") is a Brazilian documentary about animal abuse in the meat industry. It has a CC-BY license (you are free to distribute it as long as you don't charge for it) and it is available on Youtube (with subtitles).
Meat The Truth is more focused on environmental consequences of consuming meat. This movie features strong intertextuality with An Inconvenient Truth, since it was made in response to Al Gore's lack of commitment against the meat industry. It is also available on Youtube (with subtitles).
Both feature graphic violence against animals and, as such, should be accompanied by a content warning and are not suited for children.
Cowspiracy is a good documentary about the environmental impact of animal agriculture, and it has Spanish subtitles.