Isoflurane is definitely the way to go.
Neutering is not as invasive as spaying and my little girl was spayed at 2 lbs and came through with flying colors. make sure you trust your vet and he is experienced with toy breeds! Good Luck!
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Roving dogs do not indicate the civilization or compassion of the society; they betray on the contrary the ignorance and lethargy of its members. -Ghandi |