I don't really think you are being unreasonable but it's just that them not doing their bit is winding you up and I'm wondering is it worth the hassle.
Is what worth the hassle? Trying to get them to help out? But what's the alternative? Just let them be lazy, entitled muppets who take and take and make life harder at every turn??
Of course it is winding me up. We're a family of five, with two teenagers who aren't helping out, and who create an awful lot of work and expense, but think nothing ought to be expected in return. This isn't just an abstract principle, this is about every day in and outs of life.
If they don't pitch in, then DH and I do everything. If I do it myself, I am seriously overloaded. If DH does it, he's too busy to give me support when I need it, and he struggles to get his own work done. Not to mention the time it takes away from just being able to have relationships with each other, or indeed between DH and the kids.
The dog is just one example, of course, but just to look at that - DH was away Thursday PM to Saturday PM. I had DD (preschool age) to look after all day Friday and Saturday, I had work to do every evening, I had a long-standing volunteer commitment for Saturday morning, and I had work to do around the house - laundry for all, evening meals for all, washing up, hoovering (needs doing because of dog), unpacking since we only recently moved.
DSD and DSS were asked by DH to do the Friday and Saturday dog walks. They agreed and decided between themselves who would do which one. Then this happens, and they leave the poor dog to suffer, while they sleep most of the weekend, and in DSD's case, go out drinking.
So what does it mean, if I am to not let it wind me up? Well, option 1, we can get rid of the dog. DH is heartbroken, DD is heartbroken, the kids are full of resentment towards me. Not a viable solution.
Then, option 2, DH gives up on idea of asking his teenage kids to pull their weight and contribute to a working household. We decide to treat them as much younger children would be treated. He or he and I, in some combination, do all the chores. We accept that we can't leave the kids to look after things, as they are unwilling to be responsible, so either can't leave home (something that comes up regularly for work reasons), or have to hire someone to be the responsible adult in the home while away. Which I guess is where we are leaning to at present, but it doesn't make me very happy, no.