[autumn star]

I have been given conflicting info and I would like some opinions please.
One vet told me awhile back that after you have your pup spayed/neutered that their weight gain will slow down considerably and that their activity level may drop as well so to slowly cut back on their food intake.
Then I was informed by another vet (just recently) that once you spay/neuter, your dog will gain most of their weight until adulthood. Blaze weighed in at 5.2 at six months and one week and he (the vet) estimated that he may level off at 10lbs since he was neutered.
What are your thoughts on these comments?
Autumn was spayed last April and she weighed on spay day 4.7 and she is now 5.5, so I did not see the considerable weight gain on her so I just assumed I would not see it on him!
Thanks for any info you can give!!!