https://vimeo.com/47978747
Good job. My niece had a big snow dog - a malamute type dog - and despite his size he was nimble. He was like lightening when he was after rats. He would sniff them out, and wait, then ... snap.
The really big rats can be a challenge for a cat, but a good cat is up for it. I have a large old ex-tom, Hamlet. He was a homeless kitten, and I am so glad we took him in. From when he was 6 months old, he has hunted vermin - sometimes appearing at the back door with bleeding wounds and the body of a big rat. He is a big, muscly cat, equal to the black waterfront rats of Sydney.
That white dog on the left looks to be of the poodle type. He will, therefore, be very smart, adroit and quick. Thanks for this picture - nice to see something positive.