marmontes - Completely harmless.

scottpreot - I have an entire yard covered with artificial grass, and it's completely harmless; rest assured. I also have two dogs, and they love lying on that grass in the sun all day. In two years, this coverage has not negatively impacted my pets in any way, so rest assured.
If you have any doubts, I can advise you to learn more about it at https://itsartificialgrass.com/. I'm sure you'll be more convinced to hear from such a reliable company to answer your question.
I don't know where you heard it could do any harm, but change your mind about it.

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carl90 - I think it's not a problem because there's safe materials. Talking about it, forgive me, but it's quite unsightly. Accordingly, consider opting to get fake grass for dogs from this resource https://www.carolinaartificiallawns.com/products/pet-dog-turf/ . It frees you from the weekly chore of mowing, and your yard will consistently boast a good appearance with minimal effort.