Enrichment for aggressive Champagne d'Argent rabbit

A Champagne d'Argent showing aggression is often a rabbit that's understimulated — they're a large, active breed and boredom hits them hard. Before we get to what your vet has likely pointed toward, I want to ask a few things so I can give you a genuinely useful recommendation rather than a generic list. Is your rabbit housed indoors or outdoors, do they have a run or free-roam time, and roughly how many hours a day are they in a confined space?

That makes complete sense — two hours of free time isn't enough for a rabbit that size, and a large cage without enrichment inside it is still just a box. Foraging and tunnels are exactly the right direction. Before I point you to something specific, is he destructive with fabric or does he tend to go after cardboard and hard plastic? And is the aggression directed at you when you approach the cage, or is it more generalised?

Perfect — that tells me a lot. The lunge at the door is almost certainly frustration, not true aggression, and a rabbit that demolishes cardboard is telling you he needs more to do with his brain and his teeth. Your vet is right: foraging feeders that make him work for his pellets or hay are the single biggest change you can make inside the enclosure. My recommendation is the Rosewood Boredom Breaker Maze-a-Log — it's a solid wooden log feeder with compartments you fill with hay, pellets, or treats, and he has to roll and nose it to get anything out. It's robust enough that a heavy chewer won't destroy it in a day, and the unpredictability of where the food comes from keeps him engaged far longer than a bowl. Pair it with a simple cardboard tunnel — the Savic Hop In tunnel is well made and gives him somewhere to retreat and feel secure, which also reduces door-guarding behaviour. The combination of foraging challenge plus a defined safe space tends to bring aggression down noticeably within a couple of weeks.

Swap it out entirely for his pellet portion — that's where the enrichment value is. Hay should still be available freely and continuously in a separate rack or hay bag, because that's not something you want him rationing himself on. Making him work only for the measured pellet amount means every mealtime becomes a mental task rather than a ten-second visit to a bowl. Most rabbits adapt within a day or two, and the shift in their demeanour once they have a job to do is usually pretty striking.

The log feeder and tunnel will make a real difference, but I'd push your free-roam time up to at least four hours if your living situation allows it — even split across morning and evening. Champagne d'Argents are genuinely active rabbits and space matters as much as in-cage enrichment. If the aggression hasn't reduced meaningfully after three to four weeks of consistent enrichment and more free time, go back to your vet — occasionally there's an underlying pain issue driving it, and it's worth ruling that out.