All VitaTienda supplements can be given to pets, dogs or cats.
From the pet not being able to swallow the capsule, open it and mix it in chicken extract or something to make it attractive.
Happy Tummy - 5 drops for a small one and 10 for a large one.
Happy Body Serum 1/4 dropper for a small dog; 1/2 dropper for a medium dog; 3/4 dropper for a large dog.
As for the amounts of other supplements, you can use the same principle as mentioned above with the Happy Tummy/Happy Body.