ohhhh I am sooo relieved to hear that Spike is doing okay. I know it is hard to leave them there, but you have a lot to be thankful over too. He did not need a surgery to remove it. But I know what you mean though, I am like that too, and when any of our dogs has had to stay at the vet. I debate with them until they let me visit my dog, several times a day, and when Hercules had a nipple he had to pass, well they gave him a big cage bottom row, so I could get in there and sit and snuggle with him, and if I was real quiet they kinda forgot about me lol...... I even had a plan to maybe be able to hide and stay the night with him hehe.
Kennel cough is just like our cold, I think I posted this on your other thread about him. Kennel Cough can come from both viral and bacterial sources. Most likely it will go away by itself, but they think it speeds the recovery up a bit if you treat with antibiotics to directly kill the Bordetella organism. Which is the bacterial form of KC. But most vets like to not give antibiotics if it is not absolutely a must, since they too, aswell as the MD's are struggling with the resistant bacterias and dont want to worsen the situation. And ther is always a little risk that the KC is viral (10-15% are). If the cough is real bad, they can give a cough suppressant to help out while recovering on his own. Or sometimes they give both. But it sound like a smart plan to wait for a few days, I am sure you will see improvement by then.
Give Spike a big kiss from me
Marit