Roses should discourage them?

If you can't keep your dogs of the borders regardless of what you plant it is going to get trampled particularly if they are large dogs. Also the border does not look very wide and does look dry... possibly the holly hedge is taking all the moisture. Roses only flower for a very short period of the year and apart from that just sit looking green. I'm not sure what to suggest to be honest you could try something really prickly like Pyracantha.

Border is dry. We have not had any rain for 2 weeks. Haven't bothered watering them as full of weeds at moment. The trouble with the dogs and that border is the hedge runs along next door drive and then sheep the other side. Also as you say holly doesn't help.

Can you make the border wider from front to back so it's at least three feet, preferably 4?

One part of it already is, sorry just not the part I took pic of.

Potentilla fruticosa varieties flower for a fair length of time, as does Erysimum 'Bowles Mauve', but most shrubs are only in flower for a couple of weeks. One way of injecting colour is to use variously coloured leaved shrubs mixed with perennial flowering plants - Euonymus fortunei varieties are good for variegated leaf colour and are evergreen, and Brachyglottis Sunshine is a good grey leaved evergreen, has yellow daisy flowers (which I loathe, spend all my time trimming it back to get rid of them, but other people like them). The trouble is, none of these will like dogs charging all over them.

Thank you so much. Ben used to be very good but see puppy do it and follows. Next door has a 7yr old female lab that not been done and where Shadow only 10 months vets don't like big dogs done till they 1yr to 18 months. When she's in season she's up and down driveway with with Shadow trying to get to her going all over my border. She even made it out of her garden and into my front garden but luckily I had my side gates closed. Hopefully once he is done he won't be bothered by her and will calm down. Do you think a Choisya ternata sundance would work there. I had 1 in an old garden and just thought of it (just looked up the name :-))

Just looked up Potentilla. Its lovely. Again thankyou.

beware - there's a perennial form of Potentilla with strawberry like leaves, a sprawling plant called P. nepalensis, that's not the one I mean and it might be what you're offered in a garden centre, if you were thinking of asking for one. Common name of the one I mean is shrubby cinquefoil.

Agree with you Bamboo, I have the (pretty yellow flowered) sprawling Potentilla, inherited with the house. It has taken over the garden and the lawns, so much so that the lawn is being poisoned to get rid hopefully, though the roots are so tenacious I am not holding my breath. Do be careful what you buy no varietgated ground elder for example, giant horsetails or some of the Lamiums can be invasive. I have violets, which I love, but are thugs in the garden, pretty plant and you wouldn't believe it!