We suddently lost our dog, that has been with us for almost 10 years. Is there any puja or mantra that I could do, and also can a dog attain liberation.I have always offered my pet ,a part of the prasad from my worship, will this in anyway help the next birth of the dog.

Swamiji says:
It would be appropriate to chant Mahamrityunjaya Mantra.
Animals do not attain liberation. They become reborn in another form - possibly human.
It is appropriate to offer prayers and to perform pujas for the upliftment of that soul.