{{Enemy Infobox
| image=FileHoundeye.jpg|250px
| name= Houndeye
| affiliation= Xen
| type= Wildlife
| health=*{{Abbr|20/20/30|Easy/Medium/Hard}}
*{{Abbr|10/15/25|Easy/Medium/Hard}} (''Half-Life'' Dreamcast)
*80 (''Half-Life 2'') (cut)
| weapons= Sonic attack
| entity=*monster_houndeye
*npc_houndeye (HL2) (cut)Playable Development of Half-Life 2 game|''Half-Life 2'' leak files
| designer=*Ted Backman''Half-Life 2 Raising the Bar''
*Steve Theodore{{IA|20070513091613/http//|Steve Theodore's personal website}}
{{Quote|Did you see that thing, with the... the missing leg?|Black Mesa Security Force|Black Mesa security guard|Half-Life|FileMissingleg.ogg}}

The '''Houndeye''' is a tripedal creature that teleported to Earth from Xen after the Resonance Cascade. It is introduced in ''Half-Life''’s third chapter, ''Unforeseen Consequences''.

FileC2a4d cage.jpg|Houndeyes in captivity in the Alien Research Labs.|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 Research Facility|Black Mesa's Sector E|Biodome Complex.

==Behavior and skills==

The Houndeye is an excellent example of a social animal in terms of pack hunting. Like many other enemies in ''Half-Life'', Houndeyes move in squads up to a maximum of four members. While a shy and timid creature by itself, groups 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. Their 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 appears to be fang-like incisors.

In a pack, Houndeyes may doze off after a while, awakening if they hear a sound nearby or the pack leader sees danger.

The damage and the color of the Houndeye's sonic attacks change depending on the number of units in a squad.{{YouTube|Lqxag2TDqtQ|Half-Life - Houndeye Sonic Attack Behavior}} Squad members lose their ability to charge their shock waves and revert to their base attack when their leader gets killed. However, this does not occur when a random unit in the squad gets killed

{| class="wikitable" style="margin 1em auto 1em auto;text-align center;width 50%"
! Size
! Squad
! Color (RGB)
! Damage (Base value)
| 3 units and 1 leader
| Yes
| style="background-color rgb(62, 33, 211); color white" | 62 33 211
| 60
| 2 units and 1 leader
| Yes
| style="background-color rgb(67, 85, 255); color white" | 67 85 255
| 45
| 1 unit and 1 leader
| Yes
| style="background-color rgb(101, 133, 221); color white" | 101 133 221
| 30
| Any size and no leader
| Yes
| style="background-color rgb(188, 220, 255)" | 188 220 255
| 15
| Any size
| No
| style="background-color rgb(188, 220, 255)" | 188 220 255
| 15

==Behind the scenes==
The Houndeye is one of the few creatures from the series that went virtually unchanged from the first sketch. It was originally nicknamed "Roundeye". 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. 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. The markings were designed to break up its silhouette.

This creature was initially designed as a friendly character, but play-testing revealed players’ tendencies to "shoot first and ask questions later".http//www.gamasutra.com/view/feature/131815/the_cabal_valves_design_process_.php?page=3 The Cabal Valve’s Design Process For Creating ''Half-Life'' by Ken Birdwell (December 10, 1999)

In Online Gaming Review's early ''Half-Life'' Monster of the Week Feature preview, the Houndeye was given the WikipediaTaxonomy (biology)|taxonomic designation "Sonicanis myriops" Lat. "Many-eyed Sound-dog".{{IA|19980208040236/http//ogr.com/specials/monsters/houndeye.shtml|''Half-Life'' - Monster of the Week feature|OGR.com}} Houndeye were originally to use digestive fluid and its claws as attacks, while it only uses its sonic attacks in the final version. The sonic attack had been intended to stun the player which would allow the other members of the pack to attack with their claws. The pack leader was originally going to be more visually distinct from the other pack members by using a unique animation in which stood on its rear leg to survey its surroundings. This animation, named "leaderlook", is still present but unused in the model and can be seen in pre-release screenshots for ''Half-Life''.

''Half-Life Hostile Takeover|Hostile Takeover'', a cancelled expansion pack for ''Half-Life'', was to have a larger version of the Houndeye, dubbed Big Houndeye. They were able to emit powerful blasts that could push the playe over great distancer. This ability would prove extremely deadly in areas with hazards such as cliffs.http//valvetime.net/threads/254612 The Lost ''Half-Life'' Expansion Pack on ValveTime.net (April 3, 2016)

In ''Half-Life Source'', a new sound effect (sound/player/general/sonic_damage.wav) plays when the player gets hit by a sonic attack.

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

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. Its model featured in the playable ''Half-Life 2'' leak files is broken and cannot be viewed nor used. Only the image preview gives insight of his appearance, corroborated by concept art in ''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, they were to be seen roaming in packs in suburban areas.

===''Dota 2''===

In the April 24, 2013 patch for the test version of ''WikipediaDota 2|Dota 2'', an incomplete Houndeye courier model was added to the game. The model is based on its portly appearance from the original ''Half-Life'' carrying a brandy barrel akin to a WikipediaSt. Bernard (dog)|St. Bernard rescue dog. The update included a normal and flying variation, the latter possessing wings.

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

FileHoundeye concept.jpg|Concept art.
FileHoundeye concept2.jpg|Ditto, four-legged variant.
FileBlack Ops oldpromo.jpg|Promotional image featuring Houndeyes.
FileEarly model houndeye close.jpg|Model in a zoo map.
FileEarly model houndeye side.jpg|Ditto.
FileEarly houndeye bullsquids.jpg|Houndeyes and Bullsquids.
FileEarly houndeye back.jpg|Houndeyes.
FileHoundeye pack.jpg|Ditto.
FileHoundeyes under.jpg|Ditto, in one of the earliest screenshots.
FileHoundeye pack small.jpg|Ditto.
FileHoundeye running.jpg|Ditto.
FileSci-dead-houndeyes.jpg|Ditto, with the corpse of a scientist on the floor.
FileHoundeye backleg.jpg|Houndeye pack leader looking around on its rear leg in an early version of the first map of the Biological Waste Processing Plant.
Filehl10091.jpg|Early Houndeye.
Filehl10092.jpg|Early Houndeye.
FileEarly houndeyes ready to attack.jpg|Ditto.
FileBm30.2.png|Early model.
FileHoundeye model.jpg|Early model in Half-Life Alpha|''Half-Life'' Alpha.
FileAni-houndeye.gif|Early 360° view.
Filehl10095.jpg|Still of the early 360° view.
FileOffice magazine05.jpg|Early sonic attack effect.
FileTrain hound.jpg


FileHoundeye leader look.jpg|The unused "leaderlook" animation.
FileHoundeye Dreamcast.png|Half-Life (Dreamcast port)|Dreamcast version.
FileHoundeye HD.jpg|Half-Life High Definition Pack|High Definition version.
FileC1a1b area01.jpg|Houndeyes in their first appearance in Sector B.
FileHoundeye attack2.jpg|Houndeyes attacking in violet shock waves in Sector D.
FileHoundeye attack1.jpg|Ditto.
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 light blue 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 charging Barney Calhoun after seeing him when he first sets foot in Xen.
FilePool hounds.jpg|Houndeyes near a Healing Pool on Xen.

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

FileHoundeye-body.png|Body texture.
FileLeak houndeye mdl preview.jpg|Preview image.

===''Dota 2''===

FileDota2 houndeye1.png|''Dota 2'' courier, normal version.
FileDota2 houndeye2.png|Ditto.
FileDota2 flyinghoundeye1.png|Flying version.
FileDota2 flyinghoundeye2.png|Ditto.


FileHalf card05.jpg|Unpublished trading card.

==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''

==See also==
*Panther Eye


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