The Yorkshire Shepherdess, 47, took to Instagram to share her message and was inundated with support from fans following the warning.
The mum-of-nine lives on Ravenseat farm with her children and now-ex partner Clive, 67. The couple had been married for 22 years before announcing their split in June.
In the video, the Our Yorkshire Farm star said: "Well it’s an absolutely beautiful day and we’re out and about on the farm in the countryside and enjoying these beautiful green spaces.
"Now there are simple guidelines that we follow; that’s not to litter.
"If you have a dog with you, to not have it off the leash where there's livestock and ground nesting birds, to close all the gates and to have a safe and enjoyable time when you're out in the countryside."
Amanda added: "Now, again, that can be encapsulated within the idea of taking away only memories and leaving behind only footprints.
"Now, if you want to know more about the guidelines to do with the countryside code, then please look it up online."
She captioned the video: "As Ravenseat is so prominent on the Coast to Coast path we have a huge number of hikers passing by, so it’s important that our visitors help to maintain this beautiful part of the world.
"The Countryside Code, produced by @naturalengland, is vital to the present and future of our green spaces, however there are a few takeaways which I’m particularly passionate about.
"We should all: leave gates as we find them, follow farmers instructions when animals are being moved, not approach animals and not feed animals.
"Dispose of litter – (picnics are commonplace for the children in the milder seasons, but we always make sure we leave no trace. Always take a bag out with you, use public bins or take the rubbish home with you. Protect the countryside and the wildlife in it).
"Keep dogs on a lead near to animals, make sure they follow rights of way if off lead, pick up dog poo and dispose of it in a bin.
"If there are no bins, take it home with you and dispose of it properly there.
"As a Shepherdess and dog owner I know how important they are to my job, but also the wonderful companionship that dogs bring too. Dogs should be welcomed into the countryside, but the above key rules should be followed.
"In the UK, you don’t have to go far to enjoy the countryside, but wherever you decide to explore I think it’s always worth remembering the message which I regularly say to the children, 'take only memories and leave only footprints'."
Many fans agreed with Amanda, thanking her for raising awareness of the countryside code.
One person commented: "As a hiker who absolutely loves the Yorkshire dales swaldale is the nicest and I couldn't agree more we shut gate's others leave open and take others rubbish."
Another wrote: "Good for you Amanda, as a country dweller myself, I totally understand and hope people will take heed of your advice!!!!"
A third said: "As someone who has worked on a farm most of my life I totally agree people must follow the country code and now its so dry not light fires."