Rather than getting all these vaccines repeatedly for bacterial or viral respiratory illnesses, perhaps a course of oral doses of ivermectin could be used.
Was the coronvirus/adenovirus treatment oral ivermectin for 5 days? That would probably work for all animals. Just need to figure out the dosage.
Subcutaneous if really necessary. But oral is obviously safer and easier.
/pol/ has some good parasite (worm parasite; not jew parasite) threads. search for "wormpill". or "parasite" or "anti-parasite"