I’d try to give it 24 hours, if no improvement or symptoms are worse….back to the vet. He must have gotten into something toxic, his body should be able to flush it out (with the treatment received).
I have 3 adult dogs and I cannot leave them unattended even in a fenced-in backyard.
They are like 3 year olds (mentally). They put everything in their mouth.
Just the other day I saw a hawk swoop down, it was going for the smallest dog, luckily the other dog chased it away.
PS: Did they do an x-ray to rule out a blockage? I am sure the vet would have mentioned it if he thought it was important. Some vets don’t though, as they know people can get upset about the cost.
You did say the pup was underweight, so there could be something else going on.
