my dog got kennel cough and my vet said to use Doxycycline and in jacks book it said to use bird biotic but bird biotic is Doxycycline Hyclate.Is there any difference?should i give more or less,is it bad for a dog?any help on this would be appreciated. also is kennel cough really that life threatening iv read most vets just let it take its course my vet said she is only 10 months she could get pneumonia and die.