For your cat......
First make sure your plastic eggs have little holes in the top or bottom. Most do. And some even have holes on BOTH the top & bottom. Then open your egg. Take some dried catnip a crumble a few leaves into the egg & snap closed.
Now toss them to your cat!
They'll LOVE you for it!! My cats played forever!
Until the fat one just couln't take it anymore & did this.....
For your dog....
Use the same kind of plastic egg, but this time add a yummy treat inside! Our dog Lucy went nuts for this egg!
But I wouldn't recomend this to a dog that will eat EVERYTHING & anything. Luckly ours just plays & rolls the egg. After a while we opened the egg & gave her the treat. But she seemed to have fun rolling around the floor with it for quite a while :)