X-Small ( 600×400 mm Inside Dim.) This is our Smallest Kennel, even at this size its strength and weight shows how solid all my Kennels are. If a Kennel is too small, your dog won’t be eager to use it. Look at our two dogs, you can tell by their body language that something is up. Just look at our little Foxie Molly, very Tense looking in the Kennel because of the small size.