I've never heard of dog parks making dogs aggressive. I can see, however, how being around a large group of dogs would make an "only dog" start to act more like a dog (pack behavior) and less like a human being. Lots of owners of a single dog want their dogs to act like people, not dogs. Seeing this new "dogginess" exhibited by their pooch might certainly be disturbing, and not at all what they want.
I would not take my dogs to dog parks for several reasons. First, they are terriers. They are naturally a bit more dominant and aggresive than your average lab. I don't need trouble, which would no doubt be caused by my dogs. Secondly, my dogs are small, but they don't know it. My eight to twenty pound dogs would not think twice about biting the heels of a hundred pound rottweiler. Bad idea. And lastly, I have six dogs. They already have a small pack of their own. They don't really need any more interaction with dogs than they get at home.
"We give dogs the time we can spare, the space we can spare and the love we can spare. And in return, dogs give us their all. It's the best deal man has ever made" - M. Facklam
"We are raised to honor all the wrong explorers and discoverers - thieves planting flags, murderers carrying crosses. Let us at last praise the colonizers of dreams."- P.S. Beagle
"All that is gold does not glitter, Not all those who wander are lost; The old that is strong does not wither, Deep roots are not reached by the frost. From the ashes a fire shall be woken, A light from the shadows shall spring; Renewed shall be blade that was broken, The crownless again shall be king." - J.R.R. Tolkien
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