<human>: Give me the gist of the text in a nutshell

We have recently moved last week about ten minutes from our old two bedroom apartment to a much bigger four bedroom house with a yard. We thought our 11 month old Frenchie would be over the moon about the space and a whole yard just for him. However, he instead seems to be showing signs of anxiety, and aggression since our move.

He has been hyper vigilant in the house and will go ballistic over any noise. He doesn't seem to enjoy the yard much or is apprehensive about it. He is regressing a bit on walks, and has begun to try and chase cars again, a habit we thought we ended months ago.

The clincher today, was that we took him to his favorite dog park, where he generally was very well adjusted and loved all the dogs and people, and he became violently aggressive with one of the dogs. Thankfully the dog was a relaxed breed and a bad situation was avoided.

I am worried that this move has upset our pup so bad that he may never return to the well adjusted , social, dog loving guy he was.
<bot>: dog has always been well adjusted and friendly. Since move he has been regressing, has been anxious and aggressive, resulting in him trying to attack a dog at the park. Need advice!