My Sheltie's fur is not currently at it's adult coat, he's 9 months old. However we've found that it's matting a lot under his front legs - from his harness.
He gets mats behind his ears as well, however we trimmed them all out and now brush in talcum powder which has basically stopped all the mats.
With his 'under arms' as it were we've tried talcum powder but he's still matting a lot in this area where his harness obviously moves and mats the hair. We originally had a harness similar to:
But now use this exact harness:
When we changed the harness it has improved a little, we can't use only a collar due to the lifestyle we have (regular hiking, if he falls down anywhere on a lead we don't want to have him dangling by his throat therefore choking or breaking his neck...).
The harness does fit correctly, his old one (image one) was worse but in fact too tight, the other is a much better fit. We have two brushes, a slicker and a combo soft bristle / medium spread pin brush.
What can we do to help prevent mats in the area under his front legs? Is the talcum powder route worth continuing?