Not quite sure about this one

[Lucy Dog]

Did your dog do anything wrong? That dog didn't have good manners and your dog corrected it for it. This doesn't sound like an aggression issue at all and I don't think your dog did anything wrong. If it was an aggression issue, that Shihtzu would have been dead or at the vet instead of just being pinned (corrected).

The owners of the two dogs made the error here. Sounds to me like you handled this situation completely wrong before and after the fact.

[MegansGrace]

Sounds like your dog just told the little ankle biter to back off (correction).

Definitely not something I would have alpha rolled a dog over. (I'm not a fan of alpha rolling or submitting in general, but I feel this was an over correction).

I wouldn't take this situation as a sign of aggression, I would just take note that dog parks are an uncontrolled environment so anything can happen. Next time a dog is bothering your dog, it may be time to leash up and go for a walk and come back later before it that dog pushes your dog's threshold. It seemed like you were able to read your dog so now you know for next time what to do : ). Sounds like the dog park normally works pretty well for you guys, but just know that little ankle biters may present a problem, that's all.

All the dog parks I've been to have plenty of toys. I think food/treats are a big no-no and I can see where toys can present problems too but sometimes I've seen dogs actually get a little too rough but toys aren't present to interact with. I think the key is having enough toys. An environment of plenty! Consider bringing a second ball in case you get a bigger dog that starts trying to infringe on your game of fetch.

Sorry this situation happened, but I really don't feel like your dog did anything wrong. Just be more aware of the situation next time and remove your dog before anything happens.