QUES: Order a whole size up if the half size youre looking for isnt available

correct the punctuation.

CORRECTED: Order a whole size up if the half size you're looking for isn't available.

QUES: Dogs may exhibit lethargy intolerance for exercise and weakness

correct the punctuation.

CORRECTED: Dogs may exhibit lethargy, intolerance for exercise and weakness.

QUES: The same year Pastor presented a summary of his ideas in his paper given to the International Congress of Mathematicians at Bologna which he attended with a large group of his Argentinean students

correct the punctuation.

CORRECTED:
The same year Pastor presented a summary of his ideas in his paper given to the International Congress of Mathematicians at Bologna, which he attended with a large group of his Argentinean students.