its not about profit mate. its about the safety as well as the comfort for your dog. Wooden pens are a piece of piss to get in to.. Get a galvanised run mate. Pretty cheap, look good and are far far safer than a wooden one, plus they will never rot! good luck.
p.s. go on ebaye, you can buy pieces of galvenised steel in seperate parts. making it much cheaper, if thats what your bothered about..
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galvenised runs are the beast but he was askin about kennels i got block ones cause their stayin put but some people know their guna move about so thers no other option than to get s