44 x 30 is my males crate size(airline approved). He's about 85lbs and fits quite comfortably. We bought the biggest size we could find, but I'm sure their are much larger. We bought ours on sale for $220, they can be quite pricey depending on if you want all of the extras. Wire crates are much larger and cheaper, if they're just going to be in them to eat, or for short periods of time, you could look into getting one of those. We have 2 in our vehicle, they're great for traveling and to have on hand - just in case.