在一九九一年年中，城巴要求丹尼士及另一巴士製造商利蘭著手研究十米三車軸空調巴士底盤， 以行走路窄多彎環境路線之用。在這背景下，丹尼士設計了不足十米之巨龍底盤，但很可惜未有獲得城巴任何訂單，反而在一九九三年，率先接到來自九巴為數三十部短龍底盤之訂單。丹尼士巨龍 Dennis Dragon
編號 Class：701-740
在一九九一年年中，城巴要求丹尼士及另一巴士製造商利蘭著手研究十米三車軸空調巴士底盤， 以行走路窄多彎環境路線之用。在這背景下，丹尼士設計了不足十米之巨龍底盤，但很可惜未有獲得城巴任何訂單，反而在一九九三年，率先接到來自九巴為數三十部短龍底盤之訂單。
及後由於要應付赤柱路線之需要，城巴於一九九四年向丹尼士訂購首批二十架短龍巴士，但是稍長的十點三米版本，比較九巴短龍，這批巴士主要用上了較長的前跨，而機械配搭上則相差不大。新巴士於車身配搭上，都是採用都普提供之組件，唯一跟其他兩間巴士公司最大分別是車頭組件，其設計是採取近似亞歷山大R型之頭幅設計。另外，由於城巴一向是整架巴士購入，不會在港為巴士進行車身裝配，但都普只提供車身組件散件，不設裝嵌服務，為解決以上難題，城巴便要求葡萄牙之Salvador Caetano替是批巨龍及另一批十二米巨龍進行車身裝嵌工作。及後於九六年至九七年，城巴再先後引入兩批共二十輛之短龍(721-740)，其中九七年投入服務的731-740更採用全新設計之Nippon-Denso空調組件。
跟城巴車隊中另外兩款短車一樣，短龍投入服務後迅即全面投入赤柱路線運作，而第二批短龍並取代富豪Olympian於赤柱路線之位置。除了赤柱路線，南區路線亦出現短龍之蹤影。而目前，所有短龍依然註守南區，服務該帶路線。
於二零零一年，城巴宣佈發展雙層空調無軌電車計劃，而被改裝對象就是701，有關工程於二零零二年完成，並隨後於黃竹坑車廠進行緊密測試。直到目前，701完成有關測試後，被擺放於城巴柴灣車廠。另外，在二零零二年，車隊編號713(GD6286)的短龍因意外焚燬，成為第二架退役之短龍。而編號735的短龍則於二零零八年十二月行走途中發生火警，車尾被嚴重焚燬，隨後城巴利用一架退役新巴禿鷹巴士車尾修復，令其車尾外貌有別於同期的短龍。
二零一零年當城巴試驗亞歷山大丹尼士Enviro400之後，迅即落實三十八架新車購買合約，而當二零一一年新車到港並投入服務後，首批一九九四年投入服務的短龍陸續退役。而當二零一三年年初城巴第二批購入的Enviro400到港投入服務，隊中除735及740兩架丹尼士巨龍外，其餘成員亦迅即被新車取代。735及740在路面上行走多大約一年左右，亦相繼於二零一四年五月退役，在退役前兩車主要行走M47路線，偶爾支援赤柱區一帶路線。
In 1991, City Bus requested two major bus manufacturers Dennis and Leyland to develop a 10m 3-axle air-con model. City Bus hoped that this kind of new model can be deployed on routes that facing narrow road conditions. Dennis developed a new Dragon chassis which is less than 10m in length. However, City Bus only choose Leyland product instead of Dennis one and the first buyer of this Baby Dragon was KMB which ordered it first batch of 30.
City Bus then followed to order a batch of 20 Baby Dragon in 1994 to meet the demand of Stanley routes. This batch of Baby Dragon is slightly different from those ordered by KMB. The Baby Dragon ordered by City Bus is 10.3m in length due to a longer front over hang part and the specification are similar to Baby Dragon of KMB. All 40 Baby Dragons in City Bus fleet were fitted with Duple Metsec bodyworks and this is a City Bus style bodywork which an Alexander "R" style frontal design were used. All Dennis Dragons including those 12m Dragon in the fleet were bodied by Salvador Caetano in Portugal since Duple Metsec only providing body kits. From 1996 to 1997, City Bus ordered a further two batch of 20 Baby Dragons (721-740) and those commissioned in 1997, a new design of Nippon Denso air-con unit were fitted.
Like other two short-wheel based bus models in the fleet, Baby Dragon were deployed on Stanley routes and the second batch of Baby Dragon taken the place of Volvo Olympian on these routes. Except Stanley routes, Baby Dragon can be easily found on Southern district routes and at present, Baby Dragon still play a very significant role in Southern district.
There were two Baby Dragons withdrawn from the fleet during 2001 and 2002. The first to be withdrawn was 701 which converted to be the world's first double decker air-conditioned trolleybus. 701 was undergone a series of trial in City Bus Wong Chuk Hang depot after the completion of conversion works. 701 was preserved in Chai Wan depot of City Bus after the trial completed. Another withdrawn Baby Dragon was 713(GD6286) which destroyed by a serious fire during it duties on Stanley route. The rear of 735 was serious damaged by fire in 2008 and later, City Bus repaired it by using the part from a withdrawn Dennis Condor of NWFB and as a result, it rear is different from other Dennis Dragon within the same batch.
All City Bus Dennis Baby Dragon were gradually retired from the fleet since 2011, when the commissioned of Alexander Dennis Enviro400. Those Baby Dragon entered service in 1994 were started to withdraw from service since Sept., 2011 while the remaining (except 735 and 740), delicensed in the early of 2013 when the second batch of Enviro400 delivered. The last two samples still serving commuters, mainly deployed on route M47 and seldom supporting routes serving Stanley, until their retirement in May, 2014
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