[BUG] Adding an exact weight in pounds for dog posts

## Description

The user would be able to input a number on a post to represent how much a dog weighed in pounds. This would be helpful for the fosters. 

This could go as far as to be added as a question on onboarding to save to your profile as a capability and a filter on the feed. Obviously this is a lot to change though, so consider priorities and value when looking in the future.