Hi, all! I read an article about a designer of dog toys that are mentally stimulating and wanted to share them with you. Designer's name is Nina Ottosson -- toys are sold on various websites. Here is one: http://www.surreypetsupplies.co.uk/acatalog/Nina_Ottosson_Toys.html#a4305 . They are a bit pricey but really interesting. I would love to see a dog actually figure them out.