This is a Flombo. It eats mice and lives on a fairly small island. It is manly attacked by eagles that fly and is hard for the dog to catch.
The island has gotten hotter and is making it hard for the dog to survive because of the heat. Eagles fly to a colder location while Flombos with lots of fur die off.
Huge storms come in on the island. The mice cant stand the cold weather and floods are imminent. They have started to eat fish. The dogs begin to develop long snotes to get to the fish.
After the rain eaves huge fires begin to break out destroying most of their habitat. The eagles also return feasting on burnt corpses from the fire's wrath. Dogs begin to be better equipped from the heat and can run and swim to be safe.