Are Prong Dog Collars Legal?

The legality of fanged dog collars varies by region, but here are some examples:

It's illegal in some parts of the country
France: French MPS have voted almost unanimously in favour of a bill banning the sale and use of "training collars" for dogs or cats, with fines of €750 and up to €3,750 in serious cases. Sharp collars can cause major injuries such as skin perforation and trachea compression, and the act does not apply to French military dogs, nor does it apply to capturing aggressive stray dogs.
Australia: News Corp Australia reported that Queensland will ban punitive toothed collars for dogs, and Australia has banned the import of toothed collars, and Victoria has banned the use of such devices since 2008. The RSPCA says the collars are used to "punish and cause pain to pets" and can sting their skin when pulled.
Spain: Spain's new Animal Welfare Law prohibits the use of any means of handling that may cause harm to animals, especially electric collars, pulse collars, punishment collars or choking collars.
There is no specific law on collar fangs in China: At present, there is no specific law on whether dog collars with fangs are legal, but if the use of dog collars with fangs causes obvious harm or abuse to dogs, it may be subject to animal protection regulations or moral constraints and condemnation. If a dog with a fanged collar goes out and causes harm to others or other animals, the dog owner should bear the corresponding legal responsibilities, such as civil liability.