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Hello I am Dr RB and I am a small animal veterinarian. First, I am so sorry to hear about your father. And poor Stumpers... yes, animals do grieve losses very deeply, especially when they are closely bonded with a person. Has your veterinarian completed routine blood work to rule out any medical issue that may be contributing to her lethargy or exacerbating her grief. If not, she may greatly benefit from a thorough physical exam , complete blood count, blood chemistry and urinalysis just to be safe.
If no medical cause are contributing to this, it may be time to consider starting Stumpers on a tri-cyclic antidepressant such as Amitryptilline to help with her grieving period. This drug, like any other antidepressant, would take several weeks before you saw full effect on her behavior but it sounds like she needs it; it will help both with depression as well as compulsive behaviors.
As far as flea infestation goes, late fall is the WORST time for this happen, so it is common. I would continue to treat your yard and screen porch (use Sevin dust or a professional exterminator) as well as indoors weekly until no fleas are seen. Stumpers can receive a flea treatment from your DVM known as Capstar which will kill any adult fleas on her and will stay in her system for 24 hours. At the same time as she takes the Capstar, you should place a flea/tick collar on her called the Seresto collar which will offer her protection for 8 months. They are wonderful collars and will protect her while the environment is being cleared. I hope this helps you!
Hello again, I hope Stumpers feel much better really soon..If my advice helped, it would be greatly appreciated if you could take the time to give my response a positive rating? This would allow me to receive compensation for my expertise and time assisting you and your pet.. Much thanks