"Two months ago we purchased this large stainless bowl for our Golden Doodle.
It's used for water only and today it's started to rust.
I always thought that stainless didn't rust but now I find it depends on what kind of stainless is used.
We just found out that the most commonly used stainless steel for sinks, flatware, appliances, and other consumer products is Type 304 but other less expensive and less corrosion resistant stainless steels are sometimes used and they will not provide equivalent performance.
I guess this bowl isn't Type 304."