[concretegurl]

Have you considered going to the hardware or local lumber sore and purchasing some wooden dowels and rip tack boards two hinges and one gate latch and making our own custom gate?

We had the same issue here with an oversized entrance way and unless we purchased four gates together or paid a ridiculous amount for a custom made one we had to get crafty....you could use screen-but I think it would get chewed but here's the directions we just modified them to use wooden dowels in the trip board instead of attaching string...you could router it but wood glue and finish nails do the same job.
How to Make Your Own Baby Gate | eHow.com