Our 3 lb female lionhead stopped eating. She has a bad flea infestation. Vet told us to use a tube of Vectra, which seems weird. Have read most recommend Revolution or Advantage. She is taking meds for GI stasis and getting critical care and liquid veggies. What is the correct dose pls for such a tiny bunny for Revolution and Advantage (is this the kitten type?). She had X-rays and blood tests and had tooth checks…fleas seem to be the problem.