It does sound like kennel cough (the honking cough is the key here).
Benadryl would not have been used to prevent an infection. However, the Bayril is a good antibiotic and is one I use when I feel like I need an antibiotic for kennel cough.
The trembling and lethargy may be secondary to the Benadryl and the Torbutrol tablets being used together - both are sedating medicines (the Benadryl being an antihistamine, the Torbutrol being a coedine-type tablet). You are also giving a pretty big dose of Benadryl at 25 mg three times a day for a 10lb-ish Cairn Terrier dog. The usual dose of Benadryl is closer to 1 mg per pound of dog.
I am not a huge fan of Torbutrol in kennel cough dogs because I want them coughing that kennel cough bacteria OUT of their lungs so it does not become a pneumonia. However, there is a fine line where the dog coughing so much that heir throats are sore and they refuses to eat or drink. So sometimes I do prescribe the Torbutrol tabs.
My thought is that she may just be overly sedated at this point from these two meds. I would call your vet and ask if they think it would be safe to stop the Benadryl and Torb and see how he does. I would continue the Baytril antibiotic.
If the dog is not doing well at this point, she may benefit from a day or two of IV fluids in the hospital just to get her rehydrated and feeling better if she has not been eating or drinking well during this time.
It doesn't sound like an unusual strain of kennel cough, it just sounds like kennel cough. :-) The good news is that usually within 7 to 10 days, the cough stops and the dog is feeling much better.
Good luck!
Dr. Tanis!
The wasp sting should be long over at this point. At the most, I maybe keep insect bites on Benadryl for two to three days after the initial sting if there was residual swelling or hives, but that would be it.
Amoxicillin 100 mg is OK, and actually a great adjunct to the Baytril 68mg because it kills bacteria that the Baytril does not kill very well. The antibiotics are not my concern though, they don't make you sleepy and shaky. The antibiotics ARE an key component in the treatment of the kennel cough.
I can't tell you specifically to take her off the Torbutrol and Benadryl, because I do not have a valid veterinary-client-patient relationship with you and your dog, and so by law I can't do that. I hope you understand my predicament here. However, I think I have explained to you what my concerns are here in this case, and you can use that information to make an educated decision for your dog.
You might also consider a second opinion from another vet in your area.
Dog Veterinarian
10 years experience in small animal emergency medicine