No - you can estimate a horse's age by looking at its teeth. Looking a "gift horse in the mouth" would be like judging the gift's value or appearing ungrateful. The general idea is: it may not be ideal (like an old horse) but it was free & you can still make good use of it & be grateful for having one at all.
It did not come from anywhere, the phrase should be 'Happy as a pig in muck/mud'. This creates an image of a pig rooting through a muddy field looking for roots/grubs in the ground which is their natural way of feeding.
The phrase "eat like a horse" likely originated from the fact that horses have big appetites and eat a lot of food to sustain their large size and energy levels. This phrase is used to describe someone who eats a lot or has a hearty appetite.
The Trojan Horse.A Greek poet, Homer, wrote this in his book the Odessy. (not Homer Simpson.)
adjective phrase
The phrase 'doggy steps' does not appear to be an accurate phrase. There are however, steps to potty training, housetraining, walking on a lead and communicating.
According to Wiktionary, one of the possible origins of this phrase dates back to the legend of Medusa, who was the mythological being who could turn any creature or being into stone by just looking them in the eye.
The first occurrence of the phrase "I am legend" that I'm personally aware of comes from the Richard Matheson story "I Am Legend."
stop
The Bible
from joey in friends
latin
To fight with great determination or zeal.
1820-30
from girls ...to hissy...
in concord and lexington.
facebook entry
Andy Maio invent this phrase in the early 70s