Possibly the quickest way to make 10 things less than they were.  From Spell/Write by Sack, O'Rourke & McAuliffe, 1978.

From Wee Wisdom, 1933.

From The Children's Newspaper, 1938.  Answers: Outer oval - partridge and blackbird.  Middle oval - starling and pheasant.  Inner oval - swallow and lark.  

From Our Dumb Animals, 1917.  Answers: MOLEst, cHOCK (alternate spelling of hawk), detERMINE.  

From The Children's Newspaper, 1928.  Answers: sold, bold, bald, ball, bail, pail, paid.

From The Children's Newspaper, 1963.  Answers: Pekingese, spaniel, dachshund.  

From The Children's Newspaper, 1928.

Answers: EAST, CAST, CART, CARD, HARD

From Our Dumb Animals, 1948.

From Little Folks, 1921.

From Wee Wisdom, 1933. 

Answers: 2 down is GOAT.  4 down is DEER.

From The Children's Newspaper, 1929.

From Our Dumb Animals, 1917.  Answers: SQUABble, hOWL, fERN [sea eagle].

From The Children's Newspaper, 1928.

From Broadcasting Health by Andress & Goldberger, 1933.  Answers: MILK, GROWTH, BONE

From The Children's Newspaper, 1929.

Answers: COAL, COOK, COOK

From Our Dumb Animals, 1917.  Answers: ANTeLOPe, ARMaDILLo, fERRet.

From The Children's Newspaper, 1936.

Answers:

A cat may look at a king. 

A barking dog seldom bites. 

An old fox understands a trap. 

An old ox makes a straight furrow.

"What word of ten letters can be spelt with five?  Expediency— X-P-D-N-C."  From The Children's Newspaper, 1919.

From Our Dumb Animals, 1920.  Answers: carp, mole, puma, doe, hog, coon, boars(?), cat. 

From Little Folks, 1921.