dove, dane (great dane), doe
A seven letter word that starts with D and ends with T: decrypt
duck
Domain is one of the words that starts with the letter D and ends with the letter N.
dolphin or dalmation.
A "Domestic cat" is a carnivorous animal that starts with the letter "D."
darkdankdunkdrinkdeckdockduckdamaskdesk
Panda
One word that fits your criteria is "distant." It starts with the letter 'd,' ends with 't,' and contains seven letters.
dance
darts
ballad
dogging