It looks like we might have to add a fireguard to our list of post-puppy purchases....
It is a gas fire with "artificial coal" which we have used about twice in the past 5 years. Last night Rory sneaked over to the fireplace, pinched a "coal" and set off round the house like a bat out of hell. I almost got him under the kitchen table, but at last caught up with him in the hall after he had crunched it into pieces. So, we had to have a visit from Mr Dyson!
That was hilarious - he retired to his crate when I began vacuuming, then decided the crate wasn't safe enough, so disappeared behind DP who was sitting on the stairs. When I switched off he crept out and had a good sniff at the vacuum cleaner.
So, I can't decide if we really need a fireguard or if a large box, weighted down, will get us past the tricky time. 
wtwtw whippet -Rudy - 12 weeks - midlands
kid - springer spaniel- Teddy - 11 weeks - east London
iloverhubarb crumble -springer spaniel - Lola - 11 weeks now - SW London
Purplefrog - Labrador - Rory - 11 weeks tomorrow - Fife
musicposy - ? - Poppy - 4 months
Avantia - Labrador - Mally - 10 weeks
Lou33 - Patterdale/jack russell cross- Eddie - 9 weeks, english springer spaniel - dora, 8m, and part time we have Boris - miniature sausage dog - 3.5 yrs
Watsthestory - Shih Tzu _ 9 weeks
assumpta - cockerpoo - yet to bring home
booyhoo - ? - Wonderbear - ?
pinkanimal - Siberian husky - Storm - 7 weeks - Northamptonshire
Minimu1 - resident expert(LOL) - 15 week border collie ,2 labs 5 and 12, 4 year old border collie, foster dog that doesn't count only been here 3 years staffy type cross! - Hants