Why Do Dogs Eat Grass?

Some dogs eat grass like a cow. Unless your dog’s digestion is suffering unwanted upheavals from his grass-eating habit, it’s not really a problem. Dogs have been eating grass since the dawn of time (or at least, of the species) with few ill-effects, aside from the odd bout of vomiting - and really, this is one of those things that seems to bother owners a lot more than their dogs; most dogs, will simply re-ingest the vomitus and go about their day unfazed.

Truthfully, nobody really knows why dogs eat grass. There are a variety of theories as to why animals that are widely regarded as carnivores would willingly consume moderate quantities of vegetation. One of said theories pertains to the fact that dogs are not, actually, carnivores. They’re omnivores, which literally means, “eat anything”.

This theory postulates that the modern-day dog eats grass in a deliberate attempt to supplement his diet with nutrients that are missing from his daily meals. The main crux, thrust, and gist of this argument centers around the idea that dogs, as omnivorous animals, are eating too much meat and need to balance this out with some greenery on the side, much as you or I might crave a nice tart salad to go with our steak.

If you ask me, this is nonsense. First of all, most of us feed our dogs primarily on kibble, which contains the full spectrum of fully-absorbable nutrients that dogs require (or at least, high quality kibble does; I can’t vouch for the quality of supermarket-brand dog food).

If you’re feeding your dog on meat alone, whether canned or fresh, there may be some substance to this theory – dogs need a wide range of vitamins and minerals for optimum health, most of which are not contained within fresh meat. It’s true that canned meat has some added nutrients; the main problem with canned food is that it’s too soft and jelly-like to maintain healthy teeth and bowels. Dogs fed primarily on canned food are far more prone to developing dental disease at a relatively early age (not to mention an increased incidence of constipation and flatulence, from the lack of fiber and roughage).

As far as dog food goes, unless your dog’s on a specific, prescribed diet, kibble should constitute the main part of his diet – you can add a few spoonfuls of canned meat for variety and temptation, if you like.

Another popular theory is that dogs use grass as a sort of natural emetic: that, since a nauseous dog lacks the phalangeal structure necessary for the good old ‘finger down the throat’ move, he’ll resort to nature’s bounty as an alternative. It’s true that grass does sometimes make dogs vomit – those tickly stems can irritate the stomach lining, and there have been a few occasions when I’ve seen dogs vomit up a chunk of something that’s proved to be indigestible, and along with the offending article, there’s also been a clump of grass in the vomit too. However, this is pure conjecture, and somewhat nonsensical conjecture at that. Dogs are perfectly capable of vomiting all by themselves, without the assistance of grass; I’ve seen too many dogs enjoying a post-prandial mouthful of mixed lawn greens, without any regurgitational side effects, to lend the theory any credence.

If you’re worried that eating grass is going to hurt your dog, you can lay that concern to rest right now. The one possible downside is that he’ll irritate his throat or stomach lining, but this issue will only cause him strife for a second or two at most: he’ll either cough the problem away, or will toss his cookies without further ado (which rarely bothers most dogs).

Really, grass-eating is nothing to worry about – it’s a life-long habit with many dogs, and if yours does decide that it’s no longer in his best interests, he’ll simply stop eating it all by himself. You may need to keep an eye on him around recently treated lawns, or anywhere where nasties like pesticides, snail bait, and rat poison could be around, since most garden chemicals are highly toxic to dogs. Ideally, you’d be keeping an eye on him anyway if he’s around those substances, but grass-eaters are at higher risk than most since they’re more likely to ingest plant matter that herbicides and other toxic chemicals have been sprayed onto.

In addition to this, it’s also best if he’s kept away from those clumps of dried-out grass that lie around on the lawn after it’s been freshly mowed. It shouldn’t be a problem if the grass is mowed by a push-mower; but if it’s been through a gas-operated machine, the grass will be tainted with petrol fumes and grease, which at best will taste horrible and at worst can make him pretty sick. (Fortunately for your peace of mind and your dog’s peace of digestive tract, all but the most food-obsessed dogs will usually spurn this smelly fare in favor of clean, fresh grass.)

If your dog’s grass eating is really bothering you, presumably this is out of concern for your lawn, rather than your dog, since there’s ample evidence that dogs suffer no adverse effects from frequent grassy snacks. There are a couple of things you can try doing to reduce his desire to supplement his diet with eatables from the backyard – but, because this is one area of dogdom that nobody really knows that much about, the success rate is more hit-and-miss than guaranteed: