My dog is lethargic and clingy after grooming. Could he be sick?

Hello, and thank you for your question. It is concerning that his lethargy has been persisting for so long. It is difficult to say what this could be, but some dogs are hardy enough that the only symptom they may show of being ill is lethargy. I would certainly recommend having him checked out by a vet to be sure we are not missing a medical issue. They can perform a full physical exam to check for any areas of pain or infection, and may recommend additional blood tests or x-rays depending on what is found on the physical exam. For example, some problems I commonly see after grooming visits are skin or ear infections. If this is detected by the vet, they can recommend medications to help clear the issue. If he physically checks out fine, it is possible this may be a purely behavioural issue, in which case the vet can also provide advice on how to help as well.

I hope this helps, and that Chewy is feeling better soon!