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I'm sorry Fudge has these signs and understand your concern for her.
The fact that urine is dripping is a worry and, given her history, we would consider:
- A urinary tract infection
- Cystitis
- Urinary crystals or bladder stones
- A bladder mass
- Urinary incontinence (especially if neutered early in life)
- Etc.
As she is also lethargic, I'd worry about a fever, infection or pain.
A vet visit is needed so we can examine her and analyse her urine. If concerned, the vet may also advise on a bladder scan.
Her treatment will depend on what is going on and may include e.g. antibiotics, anti inflammatories and bladder supplements.
At home, ensure she is able to pass urine and offer plenty of water to help 'flush her through'.
Hopefully she is back to normal very soon.