Twins Carlos and Miguel received bulldog puppies from the same litter for their birthday. Their parents thought they would be learning responsibility by caring for the dogs. Both boys fed and played with their dogs every afternoon. Both dogs slept by their beds each night. When baseball season started, Carlos had practice five days a week. Although he still took good care of his dog, he was not able to run and play with the dog as much as he had before baseball season. When the dogs went to the vet for a check-up, the vet told the boys that Miguel's dog was in great shape but Carlos' dog had grown a bit too heavy.%0D%0A%0D%0AThe weight difference in the twin's dogs was caused by
