Pea gravel for substrate?

I just framed and fenced in below my 2nd story deck, and I'm looking to used something other then dirt and grass for the floor.

I'm considering taking in a truck load of pea gravel and pouring out on top of the grass.

Anyone have any thoughts on this idea?

 

I would build a wood floor in your kennel like an above ground.

 

Wouldn't that be a breeding ground for bacteria? I wouldn't think it would hold up well to piss and shit? There is a kennel build in the stickies that uses gravel. Is there a downside to it?

 

Is the upper deck going to stop the rain from getting in the area? If the dog starts digging with I will become a muddy mess.

 

I use pea gravel in my kennel runs and also have it in a "kennel area" to excersise my dogs. ofcourse it needs cleaned