Hi Emma - glad he calmed down, poor fella.
Here are the ingredients in the Purina HA:
Starch, hydrolyzed
soy protein isolate, vegetable oil, calcium phosphate, partially hydrogenated canola oil preserved with TBHQ, powdered cellulose,
corn oil, potassium chloride, vegetable gums (gum arabic, guar gum), choline chloride, DL-Methionine, salt, magnesium oxide, lecithin, taurine, zinc sulfate, ferrous sulfate, Vitamin E supplement, manganese sulfate, niacin, calcium carbonate, Vitamin A supplement, copper sulfate, calcium pantothenate, thiamine mononitrate, riboflavin supplement,
garlic oil, Vitamin B-12 supplement, pyridoxine hydrochloride, folic acid, Vitamin D-3 supplement, calcium iodate, biotin,
menadione sodium bisulfite complex (source of Vitamin K activity), sodium selenite
I wonder what they mean by "starch"
- weird. The ingredients in bold can be problematic for dogs. The one is red can actually be toxic and is a real concern, in my opinion.
It's so tough to say why your baby was throwing up yesterday after eating this food. However, if this were me and my dog had that kind of reaction to a food -- I just would not feed it again. It sounds possible that an ingredient could have been causing severe reflux too. Is he on anything to heal his tummy? Were ulcers ruled out?
Since he has shown sm. intestine issues and undigested food in his stool - were probiotics and digestive enzymes discussed? It may be something to consider here.
What types of foods (and proteins) have you tried in his past?
One other thing I can recommend is that you consult w/ a Canine Nutritionist.
Susan Davis has been used by many here, with wonderful results - she does phone consults regarding this very thing.