German Shepherd dog

Does any body out there have this problem?  Dryness on both sides of mouth - the lip folds seem cracked and dry.  Any suggestions for application of something would be helpful.  Something safe because he likes the vasaline off.  I believe it has to do with tennis ball chewing.  What do you think?  Thanks in advance.

I stopped as of right now.  But you did not give me any information on what I could use.  I will do some more research. 

Tennis balls are small enough to choke large breeds such as the GSD and Golden Retriever. I read about a guy who nearly lost his Golden that way. Fortunately, he was able to dislodge the ball once the dog went unconscious. When he took the dog to the vet to make sure it was okay, the vet told him he'd seen a lot of dogs die from choking on tennis balls. By the time he sees them, it's far too late to save them.

My dogs tear 'em to shreds within minutes, anyway, so I gave up on them long ago, even before I  knew this.

I have one Female that always gets  dry "crud" leaves, hairs, sand, stuck to her lips where they meet in the back. You can pull it off and it sometimes pulls off the delicate lip skin. What I keep around is a bottle of the liquid 100% Vitamin E oil. It's thick, it's sticks and stays on, and isn't tasty enough for them to lick off either. it works for us anyway  It's the 4000 IU 4 ounce bottle that I buy and it lasts for years and years and years and has other healing properties also. I use it on my scrapes and cuts also. Very affordable also if you buy it for Humans.

Diatbda

"Wash your bowels and water buckets daily." 

I had a feeling that the water buckets had something to do with it, but I had no idea my Bowels could have a reaction with my dogs lips.  Oh well, you learn something new everyday.  Poor Blue and CJ!

I use stainless bowls and my dogs are not loose lipped.... I find most times it is silava dried on lips from working causes them to chap and I have had no issues since I started damp cloth over dogs lips after they have been tracking or tugging andything that would cause salivating excitedly.