Yep, Vectra can be used on rabbits, but there are some risks of skin irritation and chemical burns if dosed incorrectly. It’s usually only used in cases where rabbits are being exposed to mosquitos in an area with Myxomatosis. Here’s some info on it’s use in rabbits (this dosing protocol was developed by a very respected vet in my old town that works with the rabbit rescue: https://www.vgr1.com/vectra3d/) . At the rescue they have to house the rabbits outside so they give them all Vectra 3D to keep mosquitos away. I don’t see the cat and kitten version on the chart, but you should be able to compare the cat and kitten concentrations to the dog concentrations and make sure your dose is in the right zone.
In your case, it could be because the vet wants to quickly break the tapeworm life cycle so they don’t keep getting reinfected, because revolution won’t repel, as Bam said. Fleas host the larval stage of tapeworms and then the rabbit (or cat usually) gets infected by eating a flea during grooming. Tapeworms are not life threatening, just gross and annoying (lol). Are you taking other measures to deal with the fleas in the area (like treating other pets and vacuuming carpets with diatomaceous earth)?
All of that said, no harm in calling your vet and asking for clarification!
With all of these spot treatments, once they are dry it’s usually safe if they groom the area. So with my bonded buns, I will separate them while the product dries so they don’t immediately groom it off of each other.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.