Here is a 2005 article:
50,000 greyhounds every year
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Giles Tremlett in Madrid
Saturday 31 December 2005 19.22 EST First published on Saturday 31 December 2005 19.22 EST
Somehow Rey had managed to struggle free from the rope strung around his neck, after being left to die a slow death by strangulation as punishment for being a bad Spanish greyhound.
Rey, who had a life-saving operation on his neck and throat wounds last week, was lucky. Campaigners estimate that 50,000 greyhounds are killed by their owners in
Spain each year after they grow too old, or turn out to be too slow to hunt with.
Hanging is just one of the methods used. Dogs have been found thrown into wells, burnt alive and even injected with bleach.
The dogs left to die after they 'humiliated' their masters