Britney Off the Hook in Doggy Mishap

The Society for the Prevention of Cruelty to Animals has resolved its investigation into Britney Spears' dog, and has decided the popwreck did nothing wrong ... well, at least when it comes to her dog.

The president of the Los Angeles chapter of the SPCA tells TMZ the dog did fracture his leg -- but does have a cast. The incident occurred when someone (no word on who) stepped on the dog's leg (arf!) while walking into a closet. Accidents happen, y'all!

The SPCA also tells us the incident had nothing to do with her kids, as some have reported, and that the case is now "resolved." Now about those kids ...