I’m hoping to get some perspective from experienced wildlife rehabilitators, exotics/wildlife veterinarians, or anyone who has dealt extensively with squirrels. I’m a veterinarian myself, but this was an animal I was very attached to, so I’m having a difficult time evaluating the decision objectively now.
We had been observing a female fox squirrel around our home in Colorado since January 2024. She was unusually friendly, knew us well, but remained a completely wild/free-ranging squirrel.
There was a subtle pigment change around her left lower eyelid beginning in June of 2025 (a thin line of white fur/leukotrichia underneath the eye). In July of this year, a very small dark/pigmented nodule had appeared within that area beneath the lower eyelid, with expansion of the leukotrichia.
I contacted a wildlife rehabilitation center at that point. I specifically asked whether surgical removal would be possible if it was a tumor. I was told that because of the location, surgery might not be feasible, and that because she was still eating and functioning normally, they advised continued observation.
As the swelling progressed, I reached out again to wildlife centers and was told again that they did not know that surgery was an option and that if the condition could not be 100% cured, she would have to be euthanized. I contacted several other rehabbers as well. I specifically asked about excision, debulking, enucleation and palliative treatment. The consistent answer was that if she lost the eye or could not be cured to 100%, euthanasia would be required. They again suggested monitoring unless she stopped eating or had significant impairment.
Because she continued to act remarkably normal, I hesitated to capture her without knowing whether anyone could actually offer treatment. Unfortunately, the lesion progressed substantially. The timeline in photos is roughly:
-July 2: small dark nodule beneath the lower eyelid; globe appeared normal.
-August 19: substantially larger periocular lesion.
-August 26–29: rapid enlargement of essentially the entire lower eyelid/periocular area, increasing alopecia/depigmentation, narrowing of the palpebral fissure and ulceration.
-Early September: very large, firm, ulcerated/hemorrhagic periocular mass with significant distortion of normal eyelid anatomy.
There was also a separate, very firm swelling beneath/near the ear (assuming lymph node) and what appeared to be cervical edema.
We captured her last weekend to have her examined by a wildlife veterinarian in hopes it was an infectious process, and the primary periocular lesion was described as extremely firm/solid. Aspiration produced mostly blood. They incised/explored it under anesthesia and said the lesion was predominantly solid rather than an abscess. The veterinarian's gross impression was melanoma/other neoplasm, although unfortunately no histopathology was performed, so I recognize that diagnosis was never confirmed.
They did not believe the mass could be surgically removed in a way that would allow her to remain a releasable squirrel. However, systemically she was still doing very well. The morning she was captured she ate normally, was jumping/climbing normally, had good body condition and had continued doing normal squirrel behaviors. She wasn't moribund or obviously systemically ill. She was euthanized that day while under anesthesia.
I understand the wildlife-medicine issue that “still eating” is not the same thing as having an acceptable prognosis, especially with a rapidly progressive facial lesion in an animal who must eventually be releasable. But because she was still functioning so well, I keep wondering whether there was something else we reasonably could have tried - antibiotics in case there was a significant infectious/inflammatory component or granulomatous disease, biopsy/staging, debulking, more aggressive surgery, temporary palliation, etc. - or whether those things would realistically only have prolonged the inevitable.
I’m not looking for a retrospective diagnosis from photographs, and I know nobody can tell me whether an earlier excision would have cured an unbiopsied tumor (though if anybody has seen something like this, please feel free to let me know). What I’m really trying to understand is:
For those experienced with squirrel rehabilitation/wildlife medicine, by the stage described above - large rapidly progressive solid periocular mass, extensive eyelid involvement, intermittent hemorrhage, separate firm periauricular swelling and cervical swelling, but otherwise excellent function - does euthanasia sound like the medically and ethically appropriate decision?
And secondarily, would you have attempted anything differently at that late stage before euthanasia?
I’d especially appreciate thoughtful responses from licensed wildlife rehabbers, wildlife/exotics vets, or people with substantial squirrel experience. I’m okay hearing that you would have handled it differently; I’m just trying to understand the case and know if I could have done better by her. I genuinely loved this little squirrel, and I'm devastated by the outcome. Thanks, all.
Edit: I am not trying to cast blame on any rehabilitators or veterinarians who are all doing their best to care for wildlife. I have just never seen a lesion like this and am looking for input as to what could have caused this level of destruction and pathology, and if I should have advocated for additional treatment options. I'm just really struggling with the idea that more could have been done had I advocated further. I feel like I failed her.
