{{Enemy Infobox
| image=FileHoundeye.jpg|250px
| name= Houndeye
| affiliation= Xen
| type= Wildlife
| health= 30
| weapons= Sonic attack
| entity=*monster_houndeye
*monster_houndeye_dead (HL1)
*npc_houndeye (HL2) (cut)Playable Half-Life 2 Beta|''Half-Life 2'' Beta files
| designer=Ted Backman''Half-Life 2 Raising the Bar''
{{Quote|Did you see that thing, with the... the missing leg?|Black Mesa Security Force|Security guard|Half-Life}}

FileHounds resting.jpg|Houndeyes in captivity in the Advanced Biological Research Lab.|thumb|200px|left

Possessing only three legs and a thorax, the Houndeye is a faint yellow-green in color, with electric blue tiger-like stripes adorning its spine. In place of a head there is a large, black, insect-like WikipediaEye eyes|compound eye protected by eyelids. Houndeyes apparently communicate through a series of high-pitched sounds somewhat similar to the barking of dogs, on which its behavior and movement are also partially based, hence its name (its sounds are actually based on that of dogs). Like most of the creatures found on Xen, Houndeyes are studied in Black Mesa's Sector E.

==Behavior and skills==
The Houndeye is an excellent example of a social animal in terms of pack hunting. While a shy and timid creature by itself, groups of three or more display resonant behavior, emitting destructive harmonic sonic attacks in shock waves, capable of injuring those they attack or destroying nearby objects such as wooden crates or windows. The shock waves are always visible, appearing as violet or white circles around the creature. The eyelids are seen moving only when they are excited.

Although they are not seen displaying this trait often, Houndeyes appear to be carnivorous creatures, as one is seen eating a dead security guard in ''Half-Life Blue Shift''. The Houndeye's mouth is located on the underside of its belly, close to the eye, filled with what appear to be fang-like incisors.

==Behind the scenes==
FileHoundeye attack2.jpg|Houndeyes attacking in violet shock waves in Sector D.|200px|thumb|right

*The Houndeye was originally nicknamed "Roundeye".

*It is one of the few creatures from the series that went virtually unchanged from the first sketch.

*According to Ted Backman, designer of the Houndeye, its anatomy was inspired by a huge three-legged tabby cat named Tripod that lived in his neighborhood as a child.

*The Houndeye was originally to use digestive fluid and its claws as attacks, while it only uses its sonic attacks in the final version.

*The Houndeye sonic attacks were originally to stun the player to allow the other members of the pack to attack with their claws, while sonic attacks only take a few health points in the final version.

*At some point in ''Half-life'' development, the damage done by the pack's sonic attack would have increased wikipediaExponential growth|exponentially, depending on the number of Houndeyes in the pack.http//web.archive.org/web/20030419155711/http//www.gamespot.com/features/halflife_old/page4.html Gamespot Half-Life Exclusive Preview

*Houndeyes were originally to be lead by a pack leader that would have stood on its rear leg to look around. The animation, "leaderlook", is still present in the model and can be seen in pre-release screenshots for ''Half-Life''.

*Its eye was originally to feature prismatic coloring, possibly cut for difficulties in implementation at the time of ''Half-Life'''s release. However it was apparently made for the cut ''Half-Life 2'' model.

*A proposed color was a green grey color, eventually replaced by a yellow.

*The markings were designed to break up its silhouette.

*In its early development, its shockwaves were yellow.

===''Half-Life 2''===
FileHoundeye concept 2.jpg|Concept art for the ''Half-Life 2'' version.|thumb|200px|left

*The Houndeye was originally to appear in ''Half-Life 2''. Much thinner than the bulky, healthy Houndeye seen in ''Half-Life'' and its expansions, hunger was to have turned it into a fierce and voracious predator.

*The Houndeye model featured in the playable ''Half-Life 2'' Beta files is broken and cannot be viewed nor used. Only the image preview gives insight of his appearance, corroborated by ''Raising the Bar''.

*Like the Bullsquid, also cut from ''Half-Life 2'', it was to be glimpsed during the original train ride to City 17 and appear in the WC mappack.html">Canals.WC mappack Some Houndeyes can be found in the WC mappack map "prefab_canals.vmf", last edited December 2002.WC mappack

*Houndeyes were also to be seen in a slideshow revealing the events between ''Half-Life'' and ''Half-Life 2'' to be shown to Gordon at Eli's lab. In one of the images, Houndeyes were to be seen roaming in packs in suburban areas.

FileHoundeye 2.ogg|noicon
Attack, short
FileHoundeye 1.ogg|noicon
Attack, medium
FileHoundeye 3.ogg|noicon
Attack, long
FileHoundeye 4.ogg|noicon

===''Half-Life'' and its expansions===

FileHoundeye concept.jpg|Concept art.
FileHoundeye concept2.jpg|Ditto.
FileBlack Ops oldpromo.jpg|Early promotional image for the Black Ops featuring leaping Houndeyes.
FileEarly model houndeye close.jpg|Model in showcase map.
FileEarly model houndeye side.jpg|Ditto.
FileBeta houndeye bullsquids.jpg|Early Houndeyes and Bullsquids in an early Black Mesa.
FileEarly houndeye back.jpg|Early Houndeyes in an early Black Mesa.
FileHoundeye pack.jpg|Ditto.
FileHoundeyes under.jpg|Ditto, in one of the earliest ''Half-Life'' screenshots.
FileHoundeye pack small.jpg|Ditto.
FileHoundeye running.jpg|Ditto.
FileEarly Houndeye in Black Mesa Half Life Beta.jpg|Ditto.
FileSci-dead-houndeyes.jpg|Ditto, with the corpse of a scientist on the floor.
FileHoundeye backleg.jpg|Early Houndeye pack leader looking around on its rear leg in the Beta version of a map seen in the chapter ''Residue Processing'' (the "leaderlook" animation).
Filehl10091.jpg|Early Houndeye and early Glock.
FileEarly Houndeye in Black Mesa 2 Half Life Beta.jpg|Ditto.
Filehl10092.jpg|Early Houndeye and early MP5.
FileTwo beta houndeyes ready to attack.jpg|Ditto.
FileBm30.2.png|Early model.
FileAni-houndeye.gif|Early 360° view.
Filehl10095.jpg|Still of the early 360° view.
FileHoundeye attack early.jpg|Early effect of Houndeye attack.


FileHoundeye leader look.jpg|The "leaderlook" animation in the original retail model. 
FileHoundeye HD.jpg|The HD Houndeye model.
FileHoundeye Dreamcast.png|Dreamcast model.
FileHoundeye attack1.jpg|Houndeyes attacking in violet shock waves.
FileHoundeye attack3.jpg|Ditto.
FileQuestionable Ethics Houndeyes.jpg|The same Houndeyes attacking in violet shock waves.
FileHoundeye attack white.jpg|The same Houndeyes attacking in white shock waves.
FileOf4a2000003.jpg|Houndeyes and Snark Nests being kept for study. 
FileOf4a20002.jpg|Houndeye killed by a Xen Tree. 
FileHoundeye eyelid1.jpg|Moving eyelids before a sonic attack.
FileHoundeye eyelid2.jpg|Ditto.
FileFocal Point.jpg|Pack of Houndeyes running at Barney Calhoun after noticing him when he first sets foot on Xen.
FilePool hounds.jpg|Houndeyes near a Healing Pool on Xen.

===''Half-Life 2''===

FileHoundeye-body.png|Original body texture from the ''Half-Life 2'' version.
FileBeta houndeye mdl preview.jpg|Image preview of the original ''Half-Life 2'' Beta model, in the "leaderlook" animation. 
FileHoundeye mi.jpg|Remade ''Half-Life 2'' Houndeye for the mod ''Missing Information'', based on the original model textures. Mostly similar to the original, broken model, the spine is less thin.

==List of appearances==
*''Half-Life Day One'' {{1st}}
*''Half-Life Uplink'' {{Nc}}
*''Half-Life Opposing Force''
*''Half-Life Blue Shift''
*''Half-Life Decay''
*''Half-Life 2 Raising the Bar''
* ''Black Mesa (mod)|Black Mesa'' {{Nc}}


==See also==
*Panther Eye

CategoryXen creatures
CategoryHalf-Life Opposing Force
CategoryHalf-Life Blue Shift
CategoryHalf-Life Uplink
CategoryHalf-Life Decay
CategoryTed Backman designs


|description=The HD Houndeye.
|other versions=
|cat artist=
|cat subject=CategoryGoldSrc model imagesCategoryHoundeye images
|cat type=CategoryHalf-Life screenshots