I don't even bother with that, got a 10 year old Stafford that has only ever had the 'puppy jabs' and she living a healthy life with no probs at all!!
Not many people do
The 170 is better for the big rabbits , if I hadn't promised my friend the little lamp you could of had it
Deben done away with lightforce but there new lamps is the same casing but better wiring