Looking at ideas for a border edging, have to go back to client iwth differnet plans thought about brick paving edging ( using a turf cutter to cut shape then lay in bed of mortar) using mower proof edging from Ottis or making a very different angular edging with partially burried railway sleepers.
Any other suggestions havent been given a budget, talking a 25 metre stretch.
You sound cross that other people think different from you,
If you want to learn more about a subject (wich you do not probably) you could google words like injury pet metal lawn edging and learn before you present yourself as expert that can say the whole world is wrong. But you probably think all that info online is fake and dogs in the Uk are different from dogs in the USA.
You can use any edgings that you like, Paul there is nothing wrong with that. Every product got its positive and negative points. True, the market is full with cheap quality plastic edgings that do not last- they are usually 0.25-0.5mm and made from very cheap plastic.
The product I suggested Last many years, weather and strimmer prof, I have thousands of repetitive customers that are happy with it. If you Paul do not know the material it does not mean it is not excellent material.
If you ever learned about experiment, btw, you would have known that you do not need to test all the dogs in America to get to a conclusion. Probably like you- I would not believe it myself first, when a customer that bought my edgings told me about it, but I read a lot about it. You may think that safety is not important but many customers do think the price and safety are important things. You like to have your opinion but get cross when I say my opinion- every time….
I like Steve's suggestion of 6x1 treated timber, many of the medium and large formal country estates I have visited, have used the wooden strips (where edging is used) it look's nice, suits most gardens and is easy to put in place, curves need to be shallow with notches cut in the back of the boards to provide a bit of flexibility and they weather in nicely; they don't stand out and provide a nice solid edge.