What kind of dog is it? That makes a lot of difference. If she's always been a snorer and it's suddenly a lot different than it was, or if the snoring just started, you might want to have the vet check her. There could be some kind of obstruction.
I have two Bostons and they are notorious snorers, like most other smooshy-faced dogs -they also snort, grunt, snuffle, fart and belch! Lovely little creatures! Ragan doesn't snore much at all, mostly it's only if she sleeps with her chin propped up on something. But Katy rattles the glass in the windows! Ragan's muzzle is slightly longer than Katy's. Katy's nose is almost just a dent in her face! And her nostrils are smaller than Ragans. Ragans are rounded and open and Katy's are more closed, little slits in her nose. Katy's heart is slightly enlarged which has narrowed her trachea - it can cause the breathing problem, the snorting and the snoring. She has to breathe through her mouth. There's surgery they can do to open the nostrils up more but I don't want to put her through that. It's probably nothing, but you might want to have the vet check her just in case there's something going on with her heart.
And I don't think dogs go through 'the change' like people do - that's where the term 'lucky dog' came from!