I decided not to wait until Monday but instead to take Peter to the emergency vet last night. Thankfully a clinic specializing in birds and exotics was only a few minutes away from my house.
After palpating the swelling the vet first thought it might be a foreign object but when she tried to remove it and bring it to the front it would not dislodge. She said that she had never seen anything like it before. The growth feels very hard and has definite boundaries, like a foreign object, and on palpitation it moves under the skin.
The vet works at our local aquarium and she will check with colleagues who work with amphibians to see if they ever encountered anything like it. She mentioned chalk bags in caecilians. Do newts have anything similar in their anatomy? Could it be part of a hardened or enlarged larynx? On palpitation Peter seemed slightly bloated in the abdominal region. We started him on .03 mills of Baytril (2.27mg/ml Dilution) once daily for 7 days. The vet suggested oral administration rather than topical.
If Peter does not improve we will do a fecal.
Peter is currently set up in a quarantine tank with water and a piece of driftwood to provide some area out of the water. He is definitely not bloated from overfeeding and the vet strongly recommended to keep his weight up. I just fed him some live black worms before administering the medication and he did eat a few.
Peter spends most time laying half submerged in water and his head propped up on the wood. It almost seems as if he is trying to find a comfortable position for his swollen neck.
I have a very small water filter, an Elite Mini A-130. Would you recommend to run it in the quarantine tank?
If anyone has encountered anything like this with their newts, please let me know.
I will keep you posted with any new developments.