There is no evidence or Islamic tradition that suggests dogs bark differently or more frequently on Laylatul Qadr. The night of Laylatul Qadr is considered a night of great blessings and forgiveness in Islam, and it is believed that Allah's mercy is abundant during this night.
Laylatul Qadr is a night of spiritual reflection and worship, and the focus is on seeking forgiveness and drawing closer to Allah. While dogs may bark for various reasons, such as instinctual behavior, territoriality, or alerting their owners, there is no connection between their barking and the occurrence of Laylatul Qadr.
It's important to remember that Laylatul Qadr is a night of spiritual significance, and it should be observed with reverence and devotion.