A veterinarian recommends that a St. Bernard lose weight write an integer to describe the dog losing 25 pounds

Integer = Positive Natural Number + Negative Natural Number + 0

Positive Natural Number=1,2,3,4,5 ...

Negative Natural Number = - 1,-2,-3,-4,-5, ...

Losing means you are going in backward direction.

So, Dog losing 25 pounds = - 25 (In terms of Integer)

The answer is - 25 lb since "losing" means decreasing