It is a phase in the dog growing up. Teething or time to change from gigi-susu to adult-teeth.

Anyway, whether is teething or not, we usually fence the dog up if we don't have time to watch it. Then, let it push the fence here and there. Know which area the fence can move, and clear up things to avoid biting. If no choice, then block off the area with something heavy, like a pack of 10kg rice (it may scratch/bite the pack of rice - improvise), a heavy full-wood chair (not sloppy ikea light-wood chair ), the heavy coffee table, etc.

The fence is those black colour metal, selling one piece RM10-15. About 1m length x 80cm height. Need minimum 3 pcs, but normally ppl buy 4 pcs or more.

I see. Initial, the dog is stupid enough to push one direction, it becomes trapezoid and finally collapse on the dog. Now very smart already, it knows to push two direction, alternate each time, and move the playpen/fence to the direction it wants

Stand fan / speaker maybe not heavy enough. You need something at least >5-10kg. Feel the weight of a 10kg pack of rice.

No use hide/cover. The dog got claws to dig and teeth to bite. After all, dogs dig to bury bones. Solution is to lay the cables a longer route or hang it high up (ugly). Or use plastic trunking (possible to bite also).

A problem maybe the dog won't like its toys, and prefer other people stuff/toys. Just take note on this. Try blow up a party balloon (ask b/f or male) fully, then release half the air out. Let the dog play to entertain himself.

My fence was bought few years ago. At that time, only RM10/pc. Then increase to RM12, then RM14. Now is RM19 already ? I got total at least >14+ pcs in two locations Some are used to block the kitchen and staircase. Cause we taught the dog how to climb up and down the stairs