The only issue I can see is this: Having two separate brains, one at each end, would almost invariably be detrimental - too complicated to coordinate. Now, the occasional such twin would be a more effective hunter, and so would tend to succeed. It also, as a genetic quirk, developed a higher-than-usual likelihood of being born as conjoined twins, in this particular arrangement. So let's work with that - in the distant past, this catcat was a large predator, which evolved bidirectional knee joints to improve maneuverability. Now, a cat's a predator, so why would two heads on opposite sides be beneficial in hunting? Well, a predator would certainly find it useful to be able to see behind it, and to be able to reverse direction instantly. In order for this to evolve, that would have to be somehow beneficial to it. Let's start with something easier - the catcat, with a cat head at both ends.
You might be able to get something that reminds people of a cat-dog, but the closer you get to the real thing, the more implausible it becomes. In conclusion, no, I don't think it can happen, or even could happen. However, for a creature that has to run, jump, and do all of the complex things a cat or dog can do, there is no benefit to this kind of symmetry. There are some very simple organisms that can get away with this I seem to recall there are some species of worm whose fronts match their backs. The problem here is that there is no good reason for such an animal to develop a cat-dog is not any better at hunting than a cat or a dog, and I can't even begin to imagine how hard it would be for them to produce offspring of any kind. Now, as to whether or not such an animal could evolve on its own, it's somewhat plausible one possibility I can think of is a species that evolves to always produce conjoined twins. These poor creatures will be scared and confused, and all hope of cooperation will be lost in the desperate struggle to survive. Especially if their butts are getting infected and their backs are being broken and someone keeps on pulling them backwards. Eventually, one or both animals will break their back, then the middle of them will probably start dragging on the ground, then it'll get infected, then yet again the animal is dead.ģ - Fighting. Since a cat-dog is larger than a ferret, due to the square-cube law the spinal stresses will be compounded. For a real-life example, many ferret owners are aware of the high probability their little rodent has of developing spinal problems during its lifetime. Even if you could get both animals trained enough to walk around without falling over or hitting into things, their midsection is going to be dangerously unsupported. This problem would be compounded if the animals were surgically attached, as each of their immune systems would work to destroy the other.Ģ- Balance. Their butts would probably get infected by the unnatural configuration/chafing, and once that happened both animals would probably die without constant medical help. It's possible that even being so close to one another may cause some sort of allergic reaction on one or both of the animals. There would probably be some problems with even this basic approach:ġ- Rejection. To that, I would say all it really takes is to cut off the back legs of a cat and a dog, attach some prostheses to aid in waste disposal, and then tape the two animals together. I assume your first question is if a cat-dog could be created.
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