HORSEPLAY
Credit: Chicago Tribune Crossword
Robert H. Wolfe

1. Postponement stub at a horse show
2. Negative horses
3. Horse-colored waterway
4. Horse's girlfriend
5. Barn for newlywed horses
6. City leader's horse
7.  A. A. Milne's horse

Answers:

1. Rein check
2. Neigh sayers 
3. Roan River
4. Mane squeeze
5. Bridle suite
6. Mare
7. Whinny the Pooh