Can landlord change pet policies mid-lease and force me to get rid of my dogs?

Not if the dogs are listed in the lease.

If there's been problems such as your dogs attacking/scaring other tenants or crapping all over the place then your landlord can tell you to do more to control them.

Legally, the landlord has the right to change terms of lease as long as it does not relate to the agreed upon financing. I would recommend simply talking to them, almost anyone can be reasoned with.

Tell the whole story. What does the lease state about pets? Has there been trouble with your dogs?

Only if your lease says that they can change the policies at will.

In some cases yes in other cases no. If you think it is worth challenging then you will need to hire a lawyer.