Twice with a dremel, & once with small pliers.
Last night I watched a few online videos using a "HOT potato"

I washed my 5 yr old EE roosters feet.
Poured Hydrogen peroxide over the feet.
Rinsed well, & then stuck a hot potator on the Spur.
I covered the entire spur & the tat was touching the root of the spur @ the leg.
Was only on for 2 minutes, then pulled the tat off.
Using my small pliers, I clamped the spur & twisted gently.
Took maybe 2 turns & it popped off.
I lightly sprayed with Benatine & then I covered with an anticoagulant.
It was SO fast, NO muss or Fuss.
I like this method better than the dremel. My roo didn't sit still when I used it.
(PS ~ the line mark you see on hte spur is from the Dremel last time )
TRY it!!!