Hi, my parents are arguing and I want to know who's right.

So the arguement is about this: My dad took the dog out for the walk (giving my mum some free time to herself, he has also been working away all year without no holiday and is on stand by over christmas). My dog's feet were hurting and when my dad came in he said 'all right' and my mum said 'not really im worried about the dog', my dad got angry (because he was doing a favour for her so she could get stuff ready for christmas etc.) and they haven't spoken for two days. I am worried about it and don't know who's right. I think it's my dad but whats your guys view?