I don’t think they’ll get another dog, I remember it was all Benji hounding (sorry not sorry) her to get a dog and she hadn’t wanted one. She hated walking her dad’s dog too. She got her because he broke her down - it may even have been a trade off against the engagement for all we know. She fed her resentfully, she barely walked her on a field and my view is the loving talk and playing were solely for the views.
Its probably a good thing Bonnie died while they were away so her last moments weren’t Big Bro making it all about her, rolling her eyes and asking the vet had they any spare snackies.
On a serious note, if they knew she was near the end they should have been with her. When being PTS they’d want to see the humans they belonged with. When my ex had to have his dog PTS, I remember he didn’t want to go in, he wanted me or his sister to do it so he didn’t have to as it would be too painful. I pretty much forced him to go in and told him this moment isn’t about you and your pain, it’s the dog being put out of his (old and sick) and most of all that he would be looking for his owner and the last face he should see should be him cuddling him not a vet or me who wasn’t the most loved centre of the dog’s world.