If your cats are indoor only or if your dogs' outside activities are on a leash or within a fenced area under supervision, there is little risk. The other considerations for a vaccine's use are its proven safety, its effectiveness, and is the disease serious or life-threatening that the vaccine is used for. Only vaccinate if the threat is real. The following are some of my recommendations concerning your companions' health in choosing whether to vaccinate. If you can, don't vaccinate puppies under three months of age.
Vaccinations are much more stressful on the underdeveloped immune system.
Also, these vaccinations are much less effective at providing immunity before three months of age. If you feel you must vaccinate, do so with one vaccination of Distemper at three months, followed by a vaccination for Parvovirus at four months of age, and stop with that. If you can't find a single Distemper vaccine use the Distemper-measles combination. Use killed vaccines only. Kittens should only be vaccinated for Panleukopenia and not before three months of age.