Pakistan's doctrine is called the Riposte, which is basically an offensive-defensive doctrine. I remember that General Mirza Aslam Beg gave a good outline of this strategy back in 1997. Basically, Pakistan knows that India's offensive capabilities have substantially increased, and a static defence like in 1965 or 1971 would no longer be effective. So, the PA seeks to maintain strategic initiative by launching limited offensives into Indian territory as a means of tying down Indian forces, rather than sitting and waiting for an Indian offensive(s). By containing combat on the Indian side of the border, the PA hopes to reduce collateral damage, keep Indian forces dispersed, and secure territory of strategic importance for use in post-war negotiations. The spearhead of this strategy would be the 1st Armored Division in Multan.
Interestingly, India's Cold Start doctrine seeks to accomplish similar objectives, and it may render the Riposte obsolete. The Riposte was developed primarily as a counter to the "total war" Sundarjee Doctrine, which basically aimed to fully mobilize India's three strike corps and cut Pakistan in half via powerful mechanized offensives with heavy air support. This doctrine was tested in Operation Brasstacks back in the 80s. I have not heard of any new doctrine (on paper or otherwise) that PA is developing as a counter to Cold Start.
At present, Pakistan's armored forces are primarily deployed as offensive weapons, which is perhaps how tanks are best deployed as. Similarly, India's T-90 and T-72 fleets are also deployed as offensive weapons. The notable exception is the Arjun, which I think will be deployed as a defensive weapon. It is important to keep in mind that Cold Start not only seeks to forward deploy armored forces and artillery in IBGs, but to also deploy limited quantites of armor and artillery in India's Pivot Corps. The pivot corps will probably be the ones dealing with any limited PA offensives, while the IBGs launch the main operational maneuvers. I think the Arjun will fill this niche, and become India's defensive tank for the pivot corps.