I’m not sure about retailers in Australia, but if you search online usually in the US you can get decent x-pens for about $30-40. If you look for the kind meant for dogs they are more sturdy. Between 30-36″ tall is usually good for most bunnies, as long as you’re aware of possible escape routes, as Louie mentioned! Also consider how big your dogs are and make sure they can’t get to the bunnies either.
An alternative to an x-pen is to use storage cube grids (AKA “neat idea cubes”) to build a “condo”, or you can even use them to build a pen that fits the exact size you want. You can use cable ties to attach them together. These also come in handy for bunny proofing or blocking off specific areas you don’t want the bunnies to go.
I like bunny “condos” over pens because they let you build “up” so the bunnies get more space without taking up so much floor space (I’m in a small apartment). Plus I love waking up in the morning and having the buns be at eye level on the top floor of their condo. 🙂 A little more complicated to build though!
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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.