Last night after our last walk, Honey was lying down in front of a fan in my room (it's hot here, AC is also on, but she really likes the fan), and breathing very rapidly (80 breaths per minute). The breathing was shallow. Her temperature was normal (101.7), gums and eyes were normal, and she didn't seem to be in distress or pain in any other way.
She was not sleeping at first, but then she dozed off. The breathing went on like this for over an hour. I fell asleep, then woke up in the middle of the night and checked on her and all was back to normal; she was taking about 18-22 breaths/minute. She was fine this morning, and I watched her very closely after we got back from our walk, and she was tired, but her breathing was normal while she was lying down.
We were out of town visiting family last week, and just got home yesterday, so she has had a lot going on. She was very tired yesterday and this morning, but I expected that since she has been so active recently.
Also, she has been quite itchy since the end of last week because she was outside a lot and seems to have gotten bug bites (I was with her and I have a lot of bug bites, too). She is on Frontline Plus, but I have learned that Frontline doesn't protect against bugs (thinking about switching to K9 Advantix). I don't know if the breathing is related to the itching.
Lastly, she has had a few minor sneezing episodes (2-3 sneezes per episode, 1-2 times each day) over the past day or two. I assumed it was just allergies, because she is a pretty allergic dog and we were in a new environment, but perhaps this is related to the breathing, too?
Anyway, what could cause this type of breathing? I'm concerned because when I look up information about rapid, shallow breathing at rest, it points to heart or kidney failure, but she is not showing other symptoms of either at the moment. And she is only about 3 years old
We have a vet appointment this Thursday (7/12) to recheck blood work for an issue (fever/lethargy, with strange results on her blood work) that had us at the vet 3 weeks ago, so I would rather not go in before then unless it's an emergency, but was wondering if anyone had any experience with this? Is it normal? If not, what could it point to? Are there any questions I should ask the vet/tests we should run?