Gaillardia (Blanket flower) Burdundy, or even smaller variety Goblin is nice.

Some of the lower growing perennial geraniums would work as well as dianthus and/or armeria.

There's a dwarf gaura, long blooming, deep pink flowers. The deer never bit it in my yard. Pink coreopsis, too.

Maybe platycodon (balloon flowers). I grow P. grandiflorus "Sentimental Blue", which is dwarf, but I know there's a pink, and the deer supposedly don't like it, but don't quote me on that ;)
I had winter sown loads of mine for a friend that needed dwarf deer resistant plants, and P. grandiflorus fit the bill...

FYI

Pink Guara was on sale at Lowes in Butler 3 for $10