To think relative is being unfair

[coasterrome]

My family and I have a dog. There are three of us in the family, plus the dog. I work in retail, so work shifts. I am working tonight 5-9pm.

Our dog needs to go to the vet for his booster injection. Family member A made an appointment for this evening. A couple of days ago they said to me "I suppose you'll be at work at the time of the appointment so you'll get to skive off taking DDog to the vet". I told them what hours I am working today, ie 5-9pm, so no I wouldn't be able to make it for a vets appointment at that time on this occasion.

This afternoon family member A has asked me if I'm coming to the vets with DDog. I said no, I'll be at work so can't make it. Family member A then starts on a rant about how they are expected to take responsibility for DDog and nobody else pulls their weight etc. I pointed out that I usually help take DDog to the vets, as I did last time, and that today's appointment would need to have been made for a different time for me to be able to go. Family member B then agreed to go with family member A to the appointment today instead. Family member A did not consult me re timings before booking the appointment for tonight.

AIBU to think that family member A is being unfair to say that they are being expected to take sole responsibility for DDog? And to think that they should not be making passive aggressive assumptions/comments about how they're sure I'll be "skiving off" taking the dog to the vets because I'll be at work? I feel like if they wanted me to come with them, they should have checked with me what appointment times would suit me before booking it.

Yanbu. They're being a grumpy disorganised arse. If they wanted you there, they should have checked your shifts first. Basic common sense.

Christ.
WTH is it a family outing anyway? It only needs one person to take the dog!

Without knowing how much you actually do with the dog, rather than how much you say you do with the dog, nobody can say if your relative is being unfair or not.

To be honest this all just sounds like petty* family bickering and not something to get worked up about.

*no pun intended

Also I don't understand why one person can't take a dog to the vet on their own. It doesn't feel like a two person job to me.

Why do two people need to take the dog? Its a vaccination, not a cloning.

Yes, your husband family member A is being ridiculous.

‘A’ should have checked all family members availability and schedule before booking the appointment. So they are being unreasonable.

Are A and B your parents and you are the grown up child? I’m intrigued.

Why does A need a chaperone? They can't handle taking a dog to the vet? I'd be moving out.

I can't get past typing DDog every time instead of dog.

I'd expect my parents to take the dog if I were working when the appointment is. Assuming A and B are your parents. And yes, obviously not unreasonable to expect them to check your availability if they need you to help.