When I enlarge it looks most like Arctostaphylos uva-ursi.

No I was walking my lab who likes to take generous nibbles out of other people's landscaping. :D

At the very rock-bottom least, some notion of where in the world this is would help. Always amazes me, the number of peeps that show up here apparently unaware that the vegetation found on this planet varies by location! Oh wait, no.....its all the same ten or twenty plants....everywhere! Sorry for riffing on you, id3ma. Just, we get that a lot!

Oh and, Boulder CO.

While it does have a look of one of the low-growing Arctostaphylos, it would be odd to see it next to a lawn, as the water needs are so different. Having said that, the nicest A. densiflora 'Emerald Carpet' that I ever saw was next to a lawn, but it was planted in a rock wall so drained thoroughly and quickly.

Maybe euonymus?

I can't tell really without a closer picture. maybe mentor barberry, littleleaf boxwood, waxy leaf privet, japanese holly, ........

Thanks to id3ma for this topic, the plant in your OP looks great. Sara Malone got me to wondering about Arctostaphylos x 'Emerald Carpet'. Apparently this is a west coast introduction and being in the mid-Atlantic I'm not familiar with it.

Previously I thought the following was species A. uva-ursi. now I'm not so sure. Could this be 'Emerald Carpet'?

To my eye anyway, 'Emerald Carpet', when given enough water, is the lushest, greenest of the Arctostaphylos ground covers in full sun. Many of the others are more drought tolerant ('Point Reyes', for example) and do not have the lush appearance of 'EC'. I think that 'EC' is also taller than A. uva-ursi. There are a whole bunch of them and I get confused unless I have them all in front of me. I tend to plant 'EC' more than anything else (I don't have turf so it is essentially my lawn substitute) so it's the one that I am most familiar with. Your photo certainly could be 'EC'. It has very red stems (red-brown), so that's one thing that you could check, but A. uva-ursi might, too.