Join Date: Jan 2009
Location: USDF Region 1, USEA Area 2, USEF Zone 3 - Maryland
If the belly straps hang down that much when they are tightened your horse needs a smaller blanket. Or you need to have the straps cut down by someone who does blanket repairs (or has a big sewing machine). Ideally you should be able to get a flat hand between the strap and horse.
And if they are turnout blankets there shouldn't be a problem. If your worried about them being ripped get a blanket with a higher denier. My guys are 1600D, pretty tough, but he still manages to have a few tears by the end of the season. But a trip to the blanket lady and $20 and they are fixed for the next season.
I've never had a blanket come off while rolling, they might shift a little but nothing major. As long as you check on them at least once a day they'll be fine. Also, it's good to take the blanket off everyday to make sure there are no cuts/scrapes underneath; I can't get out to the boarding barn everyday so my guy will go 2-3 days with his on and he's fine.