The short answers to your three questions are: don't know; you can't; maybe.
The fungal growths you see above ground are the reproductive apparatus of a bigger organism that lives underground. It forms a network of fine threads that spread through the soil, breaking down the organic material into simpler compounds that are soluble in water. Without this taking place, none of our plants would get any nourishment. Fungi are an essential part of the soil's eco-system. Because they are so diffuse, it is difficult to kill them, except by drenching the soil over a wide area in some fungicidal solution. If you successfully eradicated all the fungi, you wouldn't be able to grow very much.
Few fungi do any harm to growing plants. If the sight of the surface growths offends you, or you are concerned at the risk of poisoning, put on a pair of rubber gloves and remove them whenever they appear, before you let the dog out. Or children. You can compost them or put them in the council's garden waste bin.
If you don't know what they are, how can you know they would be poisonous to dogs? As already said, they'll soon disappear anyway, so if you have a dog, and if they are a problem for them, it's surely easy enough to keep the dog away from them for such a short time. They're a necessary part of nature. Mushrooms that is, not dogs.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
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The fungal growths you see above ground are the reproductive apparatus of a bigger organism that lives underground. It forms a network of fine threads that spread through the soil, breaking down the organic material into simpler compounds that are soluble in water. Without this taking place, none of our plants would get any nourishment. Fungi are an essential part of the soil's eco-system. Because they are so diffuse, it is difficult to kill them, except by drenching the soil over a wide area in some fungicidal solution. If you successfully eradicated all the fungi, you wouldn't be able to grow very much.
Few fungi do any harm to growing plants. If the sight of the surface growths offends you, or you are concerned at the risk of poisoning, put on a pair of rubber gloves and remove them whenever they appear, before you let the dog out. Or children. You can compost them or put them in the council's garden waste bin.
poisonous for dogs ..I just look on the vet page and they are poisonous for dogs ?
As already said, they'll soon disappear anyway, so if you have a dog, and if they are a problem for them, it's surely easy enough to keep the dog away from them for such a short time.
They're a necessary part of nature. Mushrooms that is, not dogs.
I live in west central Scotland - not where that photo is...