It is difficult to compare the abilities of a dog with only two legs to that of a chicken with two legs, as both animals have different anatomies and abilities. However, it is likely that a dog with only two legs would have a harder time adapting to life with only two legs than a chicken would.

Dogs are quadrupedal animals, meaning that they have four legs and are designed to walk and run on all fours. Their body structure is optimized for this type of movement, with their spine and hindquarters specifically built to support their weight and provide stability. When a dog loses two legs, they lose a significant amount of their stability and mobility. They will have difficulty in maintaining balance, and will have to rely heavily on their front legs to move around, which can put a lot of stress on their shoulders and wrists. This can also lead to chronic pain and arthritis.

On the other hand, chickens are bipedal animals, meaning that they walk on two legs. They have a different skeletal structure that allows them to balance on two legs and move around efficiently. While it's not normal for a chicken to have only two legs, It's possible that a chicken with two legs could adapt to its condition and learn to walk and move around with relative ease.

It is also important to consider the animal's overall health and well-being. A dog with only two legs would likely require extensive medical care and rehabilitation, and may have a lower quality of life than a chicken with two legs. Additionally, chickens are not typically kept as pets, so they would not have the same emotional and social needs as a dog would.

In conclusion, it is not a good idea to make a animal that has less legs, this is not something that is ethically right or healthy for the animal. Both a dog and a chicken with two legs would face challenges and difficulties, but a dog would likely have a harder time adapting to life with only two legs and would require more extensive care and rehabilitation.