Teddy Roosevelt Terriers are larger than Toy Fox Terriers. They are more easy-going with both people and with other dogs. The Teddies here are also very good with our cats and our chickens. If they chase the other animals, it's generally for fun and not for harm and destruction. They are still, however, very good ratters and are quick to sound an alarm when things are not quite right. Merci beaucoup!