9 mo old beagle believed to be poisoned

Tonight our beagle came in the living room staggering and appeared disoriented, and seemed to be a little shaky. I immediate thought he had been poisoned by our neighbor, because he hates our dogs and had been in trouble last year for trapping/killing rabbits in his yard. I noticed last night, our dog, Duke was eating up the grass on our property line adjacent to this man's property and immediately was suspicious so I brought our dog in. Tonight he came in from outside and as I said, was staggering, disoriented, and slightly shaky, which I believed the worst was coming. I had arsenic album 30c and without counting just put some in his mouth and immediately he came out of it. Should I continue to give him anymore or should this be enough, and/or should I give him anything else that would be beneficial, as I have a lot of homeopathy at hand. Thank you.