The BukkitBlood plugin lets your mobs bleed. It is highly customizable and does not use the common way which makes sounds.
The only command /bukkitblood or simply /bb displays information about this plugin
only-players-bleed: 'false'
If you set the only-players-bleed option to true. Mobs will not bleed when being hit.
block-id: 152
In the block-id tag you can specify any blocks id. Please note: Some values may cause client crashes!
quantity: 100
The quantity tag allows you to customize how many particles will be spawned. Please note: Setting this to high may cause player client lag!
statistics: 'true'
When the statistics tag is enabled it allows me to get statistics about this plugin.
This plugin utilises Hidendra's plugin metrics system, which means that the following information is collected and sent to mcstats.org: