Hello everyone! Thank you for your well-wishes and advice.
Shango's stopped wanting to go outside so often and still appears to be acting fine….
He's drinking water still so I called the vet before a visit and spoke with him about the situation. He said it just sounds like an extreme upset stomach and to withhold food and give him half an Ammonium AD tablet and that'll settle his stomach before I return him to a blank diet tomorrow evening....
Thanks for all your help! I'll keep you updated: it's such a scary thing to think our pups are hurt!