Do I look like a bad sitter if I don’t take on large breeds?

I’m doing a house sit for this lab retriever and I think it’s been enough for me to not want to look after bigger breeds anymore, I’ve been doing this for almost two years now and I’ve looked after Rottweilers and XL bullies which have been easier than this. This dog is just constant energy and pulls really bad on walks, and never settles. I feel like a wuss for letting this get to me, but whenever I have looked after dogs that have been “too much” in the past, it’s always big dogs. But I’m just worried incase people reach out to me asking me to look after their large breed and I say “sorry I don’t look after large breeds” I feel like it just makes me feel like a bad sitter. I feel like at the end of the day it’s my business and I can do what I want with it, but I do also worry about people judging me. And I feel like people will say what’s the point in pet sitting if i don’t sit all pets.