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Hi there. Thanks for the question. Let me see if I can help. In your description you said your dog is a shepherd.... If this means a German shepherd or German shepherd cross, then I am very concerned that your dog may be showing signs of bloat or gastric dilation and volvulus. This condition is common in young active deep chested dog breeds like shepherds, Great Danes, dobermans, Labradors, etc. this is a very serious and potentially fatal condition. I would highly recommend that you get your dog to a vet immediately for an exam to determine if this is the cause for his retching and vomiting of mucus/saliva. There is nothing you can do at home to help. Other possible causes include ingestion of a foreign body or pancreatitis. I hope this helps. Best of luck.
Yes that still fits with bloat or GDV. It's really just the dog vomiting up foamy saliva that they are producing but can swallow down to their stomach because the stomach is bloated or twisted and so the saliva can not enter it. This is seriousl. You need to go to an emergency vet right now.
I am so glad to hear that things turned out ok. Over the Internet it's hard to tell what's going on obviously. We have to base our recommendation on any possible scenario that could fit the clinical signs that you describe. It obviously would be a must worse scenario to tell you Things will be ok and then have your dog get seriously ill. Please remember to rate my response if you found our chat helpful. Take care.