There are a total of 55 9-letter words containing 'dog', and the number may vary in different dictionaries. You can specify the dictionary and order.

• amidogens ₁₆
• chilidogs ₁₈
• cladogram ₁₉
• dogearing ₁₅
• dogeships ₁₇
• dogfights ₁₉
• dogfishes ₁₇
• dogfooded ₁₇
• dogfought ₂₀
• doggerels ₁₅
• doggeries ₁₄
• dogginess ₁₅
• doggishly ₁₉
• doggonest ₁₅
• doggoning ₁₈
• doghouses ₁₅
• doglegged ₁₈
• dogmatics ₁₈
• dogmatise ₁₅
• dogmatism ₁₈
• dogmatist ₁₅
• dogmatize ₂₄
• dognapers ₁₆
• dognaping ₁₉
• dognapped ₂₀
• dognapper ₁₉
• dogshores ₁₄
• dogstails ₁₃
• endogenic ₁₇
• hodograph ₁₉
• hotdogged ₁₇
• hotdogger ₁₆
• odographs ₁₇
• ondograms ₁₆
• pedogenic ₁₉
• puppydogs ₂₄
• sheepdogs ₁₇
• underdogs ₁₅
• watchdogs ₂₀
• waterdogs ₁₅
• doghanged ₁₆
• dogrobber ₁₅
• endogamic ₁₅
• guarddogs ₁₃
• coachdogs ₁₈
• dogaressa ₁₁
• doggedest ₁₃
• doggerman ₁₄
• doggermen ₁₄
• doggesses ₁₂
• dogmatory ₁₆
• dogsleeps ₁₃
• eidograph ₁₆
• ondograph ₁₆
• spodogram ₁₅

There are 55 9-letter words containing dog in the well-known word game dictionary, 41 in the Scrabble US (US/Canada/Thailand - TWL/NWL) dictionary, and 52 in the Scrabble UK (International - SOWPODS/CSW) dictionary, and 40 in the Words with Friends (WWF) dictionary.