Issue with My First Pets Stuff

I was downloading some lots from The Sims Resource and can't place them because I was missing something.
I scrolled over the icons under the lot in the library and it said I needed First Pets Stuff,
I have everything installed so I'm not sure what the issue can be,
When I reloaded my game I noticed this. 

You're not missing it, it says "Owned". That "see requirements" in red is just to warn people before buying that DLC, since you need Cats & Dogs for this one to work.

Missing items could be from some CC. Check if there are some links in description of those lots on Sims Resource.

mslisalisa wrote:I was downloading some lots from The Sims Resource and can't place them because I was missing something.
I scrolled over the icons under the lot in the library and it said I needed First Pets Stuff,
I have everything installed so I'm not sure what the issue can be,
When I reloaded my game I noticed this. 

I was thinking that maybe whatever you downloaded may have been created with a DLC and/or patch version beyond the My First Pet Stuff. But if that was the case you'd get the error "Item created with newer version of the game".

Read up on any available descriptions for additional items you may need to have installed, like anadius pointed out.