Yes there is. Click add filter. Then choose quality rare and to the right of it choose exclude. Next click add filter and choose vender pets, and then choose exclude. Then you have to choose all the other ways to get pets, ie achievement, reputation, quest, etc, etc and exclude all of those (the only one you don't choose is wild pets). After all that the only pets that should be left are non-rare wild pets.
"Even when you are winning soundly, you must always give your opponent a way to retreat with honor. If you don't, then he has no reason to surrender. He will fight until the bitter end, and you will pay a larger price for victory."