I had a puppy for 7 days he had to be put to sleep due to parvo I have a 2 1/2 year old dog has all shots how long should I watch him for symptoms

I'm so sorry to hear about your puppy, it's an awful thing to have to put a puppy to sleep.

Symptoms will show around 7-14 days after exposure. The vaccinations will definitely help but still be on the lookout for any symptoms and get him to the vet straight away. I wish you luck :)