This insect is a longhorned beetle, also called a cerambycid. The larva is called a roundheaded borer because it has a round, cylindrical body. This species, Sarosethes fulminans (it doesn't have a specific common name), occurs in oak trees in Minnesota.
Where did it come from?
The beetle most likely emerged from red oak firewood. As larvae, longhorned beetles feed under the bark of recently dead or dying oak trees. Eventually the larvae mature and emerge as adult beetles. If such a tree is cut into firewood, the beetles will sometimes survive and continue to develop inside the firewood. When a piece of firewood is brought inside the house, the beetle becomes trapped indoors.
It is very unlikely that this insect could have emerged from any finished wood product.
Are you (or your cat) in danger?
Fortunately, these beetles pose no physical danger to humans or pets, though their appearance can be alarming. Although they are associated with firewood, they do not infest or damage any wooden items in homes.
What is the best method to control this insect?
You do not need to do anything more than to physically remove any beetles you find. If you wish to reduce the number of insects emerging from the wood, leave the firewood outdoors or in an unheated area until you are ready to burn it. Do not use insecticides to control these beetles.
