Anne, it's really important (for your pup's sake) that you understand how vaccinations work in the first place... I'll get onto that in a minute.
>What worries me is that in reality this situation could go on for months and if they cancel again I am left with a pup that will be unable to go out for the forseeable future, and that wont be good for his mental health (or mine)!
So firstly: Even in NORMAL TIMES (not coronavirus!) there are FAR more dogs put to sleep due to behavioural issues resulting from poor socialisation, than the tiny tiny number that contract one of the VERY FEW diseases we vaccinate dogs for. And we are not in normal times - we are in a time where the opportunity for socialisation is massively reduced over what it usually is, so pups are at an even more increased risk of poor socialisation. Therefore, if you want to reduce the risk of your dog dying (being PTS) or having a less than optimal life, get socialising your puppy - as best you can given the current restrictions - right away. Heck, at 11wks, you are going to start leaving the socialisation period. If you're really worried, carry the pup on pavements or in parks, but if that's all you have available right now, I'd be putting the pup down frankly.
Secondly, you use the very worrying phrase:
>unable to go out
Which always sets my alarm bells ringing. Even a baby puppy with zero vaccinations at 8wks old, should be "going out" - they should just be being carried in a shoulder bag everywhere. They should not be staying at home, and seeing nothing novel, until vaccinations have finished. That is a recipe for disaster. Nothing about the coronavirus changes this. At the very least you should have been carrying your puppy with you daily on your outings.
Thirdly, your puppy has had ONE vaccination and that - for many puppies - is perfectly sufficient to completely protect them. If the maternal antibodies have worn off, your puppy will be completely protected - as much as a puppy that's had both vaccinations. Unfortunately you don't know if the maternal antibodies have worn off or not, but instead of restarting vaccinations from scratch when this is over, just get a titre test done. Find a vet which offers Vaccicheck titer testing and test your pup to see if he is immune already to distemper, parvovirus and hepatitis. Many puppies will be, even after just one vaccination. If so, you DON'T NEED MORE VACCINATIONS, let alone starting them from scratch:
http://vaccicheck.com Your puppy will not be covered for leptospirosis, since this requires two vaccinations which are 4 weeks apart (unlike any of the other components of the vaccine which just require ONE dose, at a time when maternal antibodies have worn off). BUT - many of us CHOOSE not to vaccinate for lepto, because that vaccine is responsible for many vaccine reactions, is not a core vaccine and is not even routinely given in the US or North America. Personally, I don't give it to my dogs and insist my vet leaves it out. So I really wouldn't be concerned if you don't vaccinate for lepto.
At the end of all this mess, you're going to see all kinds of vet surgeries offering 'vaccine amnesties' to poor unsuspecting pet owners - who think they are getting a great deal restarting their pet's vaccinations from scratch. When really the poor animal doesn't need this at all, is going to end up over-vaccinated and at risk of vaccinosis and vaccine related disease.
To state it simply:
1) The only diseases you need to ensure a dog is vaccinated for, are DHP - distemper, hepatitis and parvo. Those diseases require ONE VACCINATION. Not two. Not two within a certain period of time. Not two if you've gone over a year. Not two in a 'vaccine amnesty'. Just ONE, given at a time when maternal antibodies have worn off.
2) If you don't know whether your ONE vaccination occurred when maternal antibodies have worn off, do a titer test with Vaccicheck when vets start to see clients again. Don't allow them to restart a course of vaccinations from scratch and over-vaccinate a puppy. Insist on a titer test so you know where you are.
3) Any vets saying you need to have TWO vaccinations or the second one needs to be within X amount of time from the first, are only saying that because of the Leptospirosis component of the vaccine. It's the only part that requires this. And it's a part which is very controversial and which many of us go to great lengths to avoid because we consider it to be excessively risky. So IMO you can happily skip it: This isn't a reason to start from scratch or revaccinate within a certain time etc etc etc....