Probably surprisingly few! I use my TV as a computer monitor and Charlotte will sometimes "hunt" the mouse cursor, but all her pawing at it has left exactly zero marks on my screen!
To be fair, your wall mileage may vary.. Which is a very weird sentence.
Growing up, we had Snickers. She was a Goldie-something, and hands down one of the best dogs ever.
(She had coloration similar to a Rottweiler- back body, with brown eyebrows and brown belly, but otherwise had hair and body conformation like a typical Goldie.)
In any case; when she was young, she loved to attack nature docs on the TV. Or any animal on the TV, to the extent that you could see scratched on the glass after it was turned off. (The scratches were likely in a laminate layer or something. But they were there and they were permanent.)
This was more of a one-off. My wife wanted the projector for other projects, but she was testing it out here. We usually throw these vids up on the TV, which is just out of reach for the both of them. But the TV is only 65". The projection was probably close to 12' diagonally.
Still rocking my Nintendo Wii! I mostly play GameCube games on it, but I do have Brawl, Mario Kart, Skyward Sword, and Galaxy 1 & 2. For GameCube, I have Sunshine, Wind Waker, Twilight Princess, NFS Underground 1 & 2, Double Dash, Thousand Year Door, Melee, Luigi's Mansion, Animal Crossing, and Burnout.
It's also got Homebrew so I play SNES on it too. Been running Earthbound lately. I loved Undertale, but all this time, I've never played Earthbound, despite knowing about it for the last 20 years. I even snagged NES Monopoly, which is the only way I could get my wife to play Monopoly with me lol
Anyway, I needed batteries for my keyboard and it takes some 8 hours to charge them (good old nickel batteries, hey?) so I robbed the batteries out of my Wiimote. I need to put them back already.