Welcome! My name isXXXXX am a UC Davis graduate, and currently, a Medical Director of a veterinary hospital.
I am sorry to hear about this concern for Odin.
Have to be careful. A breathing irregularity especially in a breed predisposed to airway problems should always be taken seriously.
What could be some possible causes?
- hypersensitivity reaction (insect bite or sting)
(low thyroid hormone)
- stress induced
- primary problem within the lungs
- heart disease
That is a list of some of the more common causes for breathing changes.
Good that still eating and drinking well.
I wouldn't be against saying you could give some benadryl antihistamine, because it can have some sedative effects, but if this breathing persists for a few more hours, he may need an ER trip for a good evaluation.
Benadryl can be given at a dose of 1mg per pound of body weight. Keep in mind, Benadryl tablets and liquids come in different sizes. So, an approximately 25 pound dog can get a full 25mg tablet or a half of a 50mg tablet. I usually avoid the liquid Benadryl in larger dogs (you would have to give too much of it). You can give Benadryl every 8-12 hours.
Not wanting to lay down does not necessarily mean there is a joint problem or pain issue, and doesn't necessarily point to gastrointestinal problems as well. He sounds a bit agitated. Wish I could do more. Please let me know if there is anything I did not cover for you. I hope that information has been helpful.
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