Quite a tangent, but for the purpose of avoiding anaerobic decomposition (and byproducts, CH4, H2S etc) of the dog poo and associated compostable bag (if you’re in one of those neighbourhoods), I do the same as your mum. If possible, flick it off the path. Else use a bag. Nature is full of the faeces of plenty of other things which we don’t bother picking up.