Hello, my name is***** and I would be happy to help you this evening.
As a person that spends a lot of time in the outdoors, I know from personal experience how difficult it is to properly identify mushrooms. I have given up on this and stick to other plants that are easy to properly identify.
That being said, the first question is whether or not your puppies atetrue Morels, which are not poisonous, or did they eat the so called "False morels", which are very toxin indeed. Unless you, or your veterinarian, has had a lot of experience with identification of mushrooms, it is hard to say if what they ate was toxin or not.
Please understand that I am not toxcologist. But, at least in humans, the clinical signs (vomiting, diarrhea, seizures, possible coma) usually start at about 5 to 10 hours after consumption. The primary toxin in the false morels is quickly convertied to another substance that results in the toxicity. In dogs I have seen this cause vomiting, diarrhea, and impairment of liver function. I have hospitalized many patients and had them do well. It just takes several days for them to recover.
I know this is probably too much information, but the true Morels (Morchella) and the Half free (morchella semilibera) are not poisonous. The false Morels (Verpa bohemica and Gyromitra esculenta ), which are easily confused with the good ones, are very toxic. To know the true specifics of what the affects are in dogs, the best thing to do is contact the National Animal Poison Control. They do charge a fee for a consult and they will give you a case number. But, the good news is that once you have a case number, you can call them back and discuss that case with them at length at no additional charge.
I did come across a good website that you might look at for even further information on Morels: mushroom-appreciation.com. It has a lot of information and good photos.
I hope this information has been helpful. If so, please take the time to leave me with a review. I goal is to provide excellent service and reviews help me to improve.
Kind regards, ***** *****