In the second place, the author assumes that the gastrointestinal systems of dogs and humans are sufficiently similar to ensure that treatment that is effective on humans will be equally effective on dos. Again, this is a highly dubious assumption due to the obvious physiological differences between humans and dogs. Since no evidence has been offered to support this assumption, it too can be rejected.
In conclusion, this argument is unconvincing. To strengthen the argument evidence is required to substantiate the assumption that dogs and humans are sufficiently similar in both their diets and their physiology to warrant similar treatment.
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