Dogs do not have chickens. Chickens don't lay eggs with puppies in them.
Hmm, we seem to be back in crocoduck territory. Aside from the fact that such a simplistic argument wouldn't convince a six year old, this is a very odd thing to say, because if a dog ever did give birth to a chicken, much of modern science's understanding of the natural world would have to be thrown out. In an abstract way, his statement is actually evidence for evolution. So for Ray to make this argument, one of the following conditions must be true:
1. Ray Comfort does not understand the theory of evolution at all.
2. Ray Comfort is deliberately lying about the theory of evolution.
In either case (and I actually suspect it's a bizarre combination of the two), this man is not fit to debate the topic with anyone, let alone an evolutionary biologist. To their credit, the hosts of the radio show were unconvinced by his arguments despite being christians themselves, calling Ray out as a "wacko".
So which is it, Ray? Ignorant moron, or evil liar?