HI When Darla was 10 weeks old she started coughing too, would cough so hard shed throw up white foam. Coughing would happen at night as well. Took her to vet, was bronchitis, she had a shot of ABX , then started on doxycycline for 14 days. Vet said it could turn to pnuemonia quickly with EB's and needed to be treated. My other dog (her brother 1.5 years old) was coughing too. They were both treated with the ABX and got better in about a week. I had to take Darla to vet twice , at first they put her on Cipro and it did not work...vet said sometimes Cipro is not strong enough. Hope this helps. Vet said that the coughing at night was indicative of kennel cough or doggie bronchitis.