Hello, thanks for your question today! I am Dr. Drew, and I am a licensed veterinarian. I'll be happy to help you in any way I can.
Comfortis is not likely to be what has caused Dooley's issue,
more likely, given the breed and your description, Dooley's back is painful,
probably due to a bulging disc in the spinal column.
without a doubt, he should be seen today by a veterinarian, so that anti inflammatory medicines, and muscle relaxants, can be prescribed, in an effort to resolve the issue.
Comfortis typically only causes minor digestive upset in some dogs, and that will occur within a few hours of giving the pill, rather than several days later.
so, I do believe your safest bet is to see a veterinarian today, for a thorough physical examination.
His nose is dry and he acts as if he is doped up?
a dry nose doesn't really mean much of anything, honestly...
and acting "doped up" increases my level of concern,
what can a vet do if this is an overdose?
it may just be that he is lethargic,
It's not an overdose.
you gave Comfortis almost a week ago -- signs of problems would be seen within hours.
And it's a very safe product.
you could give a whole 6-pack and likely the only effect would be vomiting and nausea.
so, get him to the vet for testing?
an exam first -- if back pain is identified based on exam, testing might not be needed.
I don't jump to diagnostics until a physical exam is performed first.
alright, thank you.
you are most welcome. Please let me know if there is anything else I can do to help.