8 month old shepherd/lab mix trouble walking?

e live in the middle of a state forest. Last week, dog got face full on porcupine needles, this week ate deer guts a hunter left behind (promptly ralphed on my carpet). Today he is having trouble walking. No whining, no bloated belly. I can touch everything, he's still trying to eat everything that looks like it's edible. Other than appearing drunk there is nothing wrong with him, well a little more gas than usual. I'm going to call the vet first thing in the morning but wondered if anyone had any ideas?