It's just weird having domestic pets in your zoo. Especially since the cats and terriers don't have a limit to the amount they tolerate in their group like the other animals. You end up with a massive amount of them even when keeping just a breeding pair and sterilising the rest and keep getting messages that they are on the verge of dying of exhaustion, even though I have several shelters for them to rest in, the only animals I've seen that die from exhaustion have been cats, terriers and turtles not sure why? And the weird thing is they aren't listed as an animal for the petting section. So removed the cats and terriers and put much better animals in their place such as the lions and tigers since I was running out of space.
Only the old german herding dog is worth having out of the dlc as it has an group limit of 8 and does not suffer and die from exhaustion and it looks cool as well being rather wolf like.