She’s coughed like this occasionally, but for the past few days it’s been constant. Her eyes also became watery and r filled with goo. She is eating and doesn’t seem to have lost any energy. I thought about heart worms but the cough is the only symptom she has. Can the cough somehow be related to the alergy that’s causing the watery eyes?

This is regarding the dog that was coughing last night with the question about benadryl. We did not give the benadryl and the dog slept the night, only coughing once early this morning.
Last night we gave him bread to help anything stuck go on down. He ate it eagerly and it did not change the coughing.
My daughter uses him as a demo dog for training (she is an apprentice). The location she trains is at a kennel so contagious illness is a possibility. He is consistently on heartworm meds and has been since he was a few months old.
To me the cough sounds like heart worm, but it seems to have come on too suddenly for that, plus he is on preventative.
He has no runny nose or other symptoms that seem to go with kennel cough. He is not acting sick.
The cough is less frequent this morning, but is still harsh sounding.
We will be taking him to the vet on Monday, but would like to help the cough now if we can.
Any thoughts?
He’ll be going to the vet; it does not seem to be an emergency.

I have a female Pit Bull that sometimes coughs. Someone told me this is a symptom of her having worms. She weighs about 60# and has not been fixed.