From Canine Theriogenology Notes by Richard Fayrer-Hosken
+ indicated cell type is present / - indicated the cell type is not present
Cell Type Proestrus Early Estrus Mid Estrus Diestrus Anestrus

Parabasal
+ - - + ++

Intermediate
+ ++ - + +

Partially Cornified
+ + + + -

Fully cornified anucleated
- + ++ - -

Red Blood Cell
+ + + - -

White blood cell
- - - + ++

Foam cell
- - - + -
Approximate 
Progesterone levels
0.1 - 1.9 2.0 - 3.9
(LH peak) 
4.0 - 8.0 >8.0 >8.0