Why can't I buy dogwifhat on Coinbase?

I've been hearing a lot about dogwifhat lately, and I'm really interested in getting some. But every time I try to buy it on Coinbase, it seems like it's not available. Could you tell me why that is? I thought Coinbase was one of the biggest and most reliable platforms for buying cryptocurrencies. Is there something special about dogwifhat that prevents it from being listed there? Or is it just a temporary issue that might be resolved soon? I'd really like to understand what's going on.