my vet gave Kash the lepto vaccination. we live in florida where it rains a lot. i also live near a lake where bacteria is common. After kash got the lepto shot, he was very drowsy and fatigued for the whole day. but the next day he was completely back to normal. so, i think you're fine. also, if he had a reaction to the shot, the symptoms would show up within 1 to 3 days of getting it. but mostly, if he hasn't had a reaction within the first 24 hrs, chances are he probably won't. but the vet says to keep an eye out for weird behavior for up to 3 days.
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