Would it be cruel to skip walking my mom’s friend’s dog today?

My mom house and pet sits for her friend a lot. They have a pit bull who goes on walks everyday and she loves it. I walk the dog often just because my mom doesn't feel like it. She works though and im not working right now. She asked me if I was gonna be able to go and walk the dog today. I said yes. Well, like I said the dog gets walked everyday. Would it be cruel not to walk her today? She's probably expecting it and will have a lot of pint up energy if I dont

Would it be cruel to skip walking my mom’s friend’s dog today?
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