Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
Mushroom (toadstool) ingestion can absolutely cause the symptoms you observe.Toadstool toxicoses are very tough to diagnose without finding the mushroom in the stomach or vomitus when he is ill. The symptoms vary greatly as some of the poisonous toadstool or muchrooms contain multiple toxins. Some of the more toxic mushrooms include; Amanita, Galerina, Clitocybe and others. (You can probably find online pictures to compare to the ones you see, but I find mushroom identification terribly difficult). This is why I treat all mushroom ingestion with caution.
That means a consultation with your veterinarian the next time he has an upset stomach and you are worried about ingestion is needed. You should probably also get rid of the mushrooms as best possible or restrict his access to that area, if possible.
Treatment recommendations are difficult. I treat mushroom ingestion aggressively. I usually recommend inducing vomiting, if the ingestion was recent and the dog is not symptomatic. I would recommend following up with at least one dose of activated charcoal as given by your vet. I would get some baseline blood levels (espeically liver values and mushrooms are notorious for causing liver failure 36 hours after ingestion) and repeat these at 48 - 72 hours. Otherwise, treatment is symptomatic and supportive and would depend, of course on what type was ingested and what signs he had (vomit/diarrhea, not eating, etc).
I hope that helps.
His symptoms, though, may not be related to eating mushrooms. There may be something else going on, and given the off/on nature of his signs, I think consultation with your vet for at least some baseline lab work and consider xrays if nothing is found on lab work is indicated.
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Have since taken Jay to be checked out at local vet also took with me some of the fungi which turned out to be toxic.He gave him a jab and now back to normal Thank you for your help and concern my dog is my life, He saved me once this was my payback.