Allergies can be frustrating to treat with herbs. In my experience the herbs either work beautifully or not at all in allergy cases. My suspicion is that some the the dogs are allergic to the plants.
I usually use these formulas:
https://homegrownherbalist.net/products/liver-formula
https://homegrownherbalist.net/products/histamine-support
The liver is the organ that eliminates histamines from the body so stimulating the liver is often helpful in allergy cases. The histamine formula normalizes histamine levels as well.
For the joint issues, this one is great:
https://homegrownherbalist.net/products/joint-formula
Don't use herbs or combine herbs with medications or use them during lactation or pregnancy without talking with your healthcare provider.