It doesn't mean everyone goes in and eats dog food, but businesspeople will use their own products to demonstrate that they feel -- that they're confident in them.
معنیش نیست همه می‌رن و غذای سگ رو می‌خورن، یعنی صاحبان کسب‌وکار از محصولات خودشون استفاده می‌کنن که نشون بدن بهشون مطمئن هستن.