A dictionary of Confusable Phrases: More Than 10,000 Idioms and Collocations

Note: 
The expression does not correlate in meaning with the
phrase dog’s life— a wretched unpleasant existence: I never knew
a sailor yet who wouldn’t tell you sailoring was a dog’s life.
three dog nights —(sl.) very cold nights: We had a lot of three
dog nights this winter before they got the heat going to the
second floor.
dog-house • dog’s home
dog-house —
1
. a dog kennel: Heidi the rottweiler was in the
doghouse yesterday after she stopped firemen reaching a
kitchen blaze. 2. (sl.) bass viol: You will not find the language
which was attached to jazz in the first spate of magazine arti-
cles — no “dog-house” for bass. 3. a small structure of a shape
suggesting a kennel: Some detail can be added to the super-
structure of the yachts, such as the coach roofs, doghouse and
hatch covers.
Note: 
The expression does not correlate in meaning with the
phrase cat house—(sl.) a brothel; a house of prostitution: How
many cat houses do you suppose there are in this town?
dog’s home —(also: dogs home) an establishment where dogs
are kept and looked after: Many dogs are now in the caring
hands of staff at the Battersea Dogs Home, but they still have
to find a permanent home.
dog Latin • pig Latin
dog Latin —bad or inferior Latin: They [speeches] are chiefly
made up of extracts from the common school collection …
sprinkled with scraps of dog Latin.
pig Latin —a jargon formed by rearranging the syllables in
a word: The great thing about speaking pig Latin is that it’s
not simply a question of learning a new vocabulary.
Note: 
Neither expression correlates in meaning with the phrase
thieves’ Latin
—(arch.) the cant of thieves: I … saw a light in-
side, and heard two words of thieves’ Latin.