My dog is very old.

to be dog tired

dog and bone

Dog don’t eat dog

a dog in the manger

He’s a dog in the manger

dogan

doggone

doggy bag

doggy-style

Dogs bark but the caravan goes on!

Dogs are usually sweet.

My dogs are barking

dogsbody

I'm doing a semester abroad in England.

I'm doing a masters in law.

I'm doing all right on my salary.

I'm doing a semester abroad in Scotland.

I'm doing a masters in chemistry.

I'm doing a semester abroad in Ireland.

I'm doing a semester abroad in Iceland.

I'm doing a masters in business studies.

I'm doing a masters in physics.

I'm doing a masters in medicine.

I am doing my doctorate.