The news is from DEBKA. Saudi Arabia does not really need allies such as Pakistan for such a task, as they already are allied with US and Israel.
What has been reported actually is that Pakistan announced to help Saudis with its territorial integrity, a very diplomatic statement devoid of any real value. Note that even if Saudi kingdom faces a meltdown and civil war with collapse of the kingdom, still Pakistan can issue the same statement which will be true (as it has already done even in the case of Syria). Territorial integrity does not mean any commitment to save the Saudi king.
On the realistic side, Pakistan is in war with Takfiris inside its own borders. The Takfiris bred and raised by Saudi Arabia.
Another point to be noted, is the fact that according to IAEA, Pakistan gave blueprints of a nuclear program to Iran, Libya and North Korea but never to Saudis.
There is a growing and widespread realization around the world including in Pakistan for the need to rein in the Saudis. In this regard, Pakistan actually refused to be part of Saudi coalition in Yemen and has kept its distance from Saudi Sunni coalition. Though Pakistan will understandably need to keep a diplomatic middle ground since it makes some money off the Saudis and has economic interests inside Saudi Arabia.
Saudis are just clutching at straws here. They are in pretty tight spot and need to console themselves with these ridiculous reports. Saudis should not be taken seriously. They are a bunch who were created by British and crowned by Lawrence of Arabia.
Very soon Hijaz will be free again.
Why are you Indian people so much excited and happy and jumping like headless chicken what you want by tagging Iranian members ? you people are sick from top to bottom, go and check your home, guard your own borders look may be any pigeon is crossing into.
Relax. It is better to answer the misconceptions than to become emotional.