My two PWCorgis are 4 months old and they are constantly wrestling, snarling, chasing, and biting one another. I honestly cannot tell if they're being aggressive or just playing. I saw a Cesar Millan episode of puppies and he says that if your pups act that way they'll end up being terrible adults. These are my first pups, my last dogs were adults when I got them so I have no idea if this is something to correct or just let them be. They don't seem to be hurting each other.

I've seen corgis play like that (Sidney included) all the time. He's very well behaved, as are the other corgis he plays that way with. They make this weird snarly noise but it's different from a real fight, which I think sounds higher pitched and much louder. It sounds normal to me, but I'm not used to puppies.

Anyone else know if this is just normal play?

As long as they are playing with each other it should be fine. The thing to watch for is fighting over toys or
other 'possessions'...you don't want either of them to become resource guarders or 'hogs'. I have one of
those and I know...the toys are mine, the bed is mine, the hooman is mine etc etc. it is nice to have two to
socialize...let them experience other corgis if you can and see if they play the same way...an older dog
may put them in their place...you just have to watch them very carefully...at some of the meetups the
older male or even female corgis will not put up with the tusseling and nipping. mine are 3 and 4 and
live with a boxer also and all three wrestle until they are tired. Edgar hates big black dogs and will not
wrestle with them (three cornered him in the dog park once) and he feels the same way about some
aggressive terrier breeds. They form phobias just like we do...best to watch them and intervene if you
think it gets out of hand. I know there are some owners who do not let their pups do any of this ...but after all
they are dogs first and pets second...just my 2 cents worth

This sounds like very normal corgi behavior. I think you will know when it is just rough play or a real fight. I would just watch to make sure the playing doesn't get out of hand. They can sometimes do permanent damage to an ear, etc. If they are a same sex pair you may have issues of domianance as they grow. Make sure you remain the pack leader! Usually my corgis fight over food, toys, human attention, or when something or somebody new comes into the house or yard. Also get them spayed or neutered ASAP! Remember they are herding dogs. Treat them as such. Get them out to socialize them early. A puppy obedience class, a neighbor dog, etc. If you really feel they are fighting and not playing you should seek a trainer before this gets out of hand. I hope this helps!

Ok awesome, yeah I wasn't sure on their puppy behavior since I never had puppies before, just adult pets. But I can see what you all mean by them being possessive towards a toy or food. That I do correct. I just got a bit paranoid after watching Cesar Millan's puppy episode on NGeo. I didn't want to end up being one of those owners you see on his show lol.