Fix dog age being 0 years

[DanielChee]

Fix dog age being 0 years

Issue Number(s): #198

What does this PR change and why?

Checklist

• [ yes ] Requirements have been implemented
• [ yes ] Acceptance criteria is met
• [ yes ] Database schema docs have been updated or are not necessary
• [ yes ] Relevant reviewers (EM) have been assigned to this PR

Critical Changes

• Database change / migration to run
• Environment config change
• Breaking API change

Related PRs

PR Number(s): #number_of_pr

How To Test

make a dog with <1year age. and <1month age.

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