Ready to be told I'm being a bit tight but a situation with my Mum is really starting to wind me up.
Mum is in her mid-fifties and since splitting with her partner has a new-found social life. She goes out most saturday nights with friends, which I'm glad about as she seems happy (she went through a period of being very unhappy after my sister moved away). However, she has a small dog and she doesn't like to leave her on her own for any longer than around 3 hours.
I only live 10 minutes up the road, so guess who is asked almost every saturday night to pop in and let the dog out. I know it doesn't seem like much of an ask but I have a really busy job and saturday night seems to be the only time I get to chill. I can't relax knowing I have to go out again at 9-10pm just before bed.
When my sister is home and they go for days out etc, I am called upon again for the same reason. It's as though the dog is made into my responsibility. If I have said I can't go over, she has given me a guilt trip..."poor dog...you don't care about her...you're so selfish". And then I end up feeling so bad that I give in and go over anyway! I've explained to her how I feel but she just went off at me, saying the above.
My partner agrees with how I feel but he would never say this infront of my Mum 
Any thoughts?