You may have 8 M's.

I -ent out to the ha-el -ood,
-ecause a fire -as in m- head,
And cut and -eeled a ha-el -and,
And -atted m- faithful do--ie's head;

And -hen -hite moths -ere on the -in-,
And moth(-)li-e stars -ere flic-e-in- out,
I flun- the stic- into a stream
For -ood old Laddie to fetch out.

-hen he had laid it on the -round,
I -ent to thro- it -ac- a-ain,
-ut he s-otted somethin- in the -rush
And stared as if it had called his name.

It -as a for-otten old tennis -all,
-re- -ith a-e, a-d lan-uishin- there;
I thre- it hard, a-d Laddie, ha---, ran
Cha-i-- hi- old lo-e throu-h the mornin- air.

-ith a-olo-ies to -. -. -eats

Letters remaining:

BGJKPQTVWXYZ

delidog: E(50) A(46) S(21)= 213
KayAnn: I(38) H(34) M(8)= 118
Fuzzy317: O(32) D(31) N (34) R() L(20)= 149
petspoil: U(12)=24
Dog lover5678: C(8)=8
Rottie: F(9)=9
ShepherdLover: T(47)-47