He may discover that the moist blades or unique texture fit his chewing urges at the time. The next thing you know, he’s eating it. Once a Chihuahua eats grass due to boredom or curiosity, without intervention, it can quickly escalate into a routine habit.
What to do:
Luckily, you are in control over what your Chihuahua does when outside, even if it does not feel like it.
By keeping your Chi on leash and harness and supervising him, you can stop him from any actions that you do not approve of. If you use a harness instead of a collar
(highly recommended to avoid potential neck injury with this breed), you can safely tug on the leash to pull him back before he eats any grass.
When you take your Chihuahua outside for a walk or even just to go to the bathroom, it’s best to keep your dog engaged which will keep him focused on other things and far less likely to eat grass. For bathroom needs, stay close, speak the trigger words of ‘go potty’ and give immediate praise when he is done. When walking, it can really help to work on heeling, which will keep him very occupied and additionally, the use of the harness to control his actions will come in handy.
Whenever you head outside with your Chi, have there be a purpose. If you just want to relax in the yard with your Chihuahua by your side, be sure to bring along a nice supply of chew toys
or provide other distractions such as a kiddie pool or sprinkler on hot summer days
Never leave your Chihuahua outside unattended. There are a host of dangers if a Chi is left outdoors alone even in an enclosed yard, including possible escape, other dogs finding a way in, hawk attack (this is real), bee attack, ingestion of pebbles and other objects that can cause blockage, ingestion of poisonous plants and stress from isolation (even if the duration is short).
Finally, implementing training can help. This breed tends to crave his owner’s attention and receiving positive or negative feedback can greatly affect a Chihuahua’s behavior. The idea is to teach your Chihuahua that eating grass is not an acceptable behavior and then to offer something that is. If, despite the above guidelines, you find your Chi eating grass, clap your hands while giving a firm ‘No’. This will distract him; though do be sure to find a tone and volume that does not overly startle him.
As soon as he is looking at you, offer praise for not eating it anymore (even though it was you that put a stop to it) and immediately refocus his attention elsewhere. You can offer a toy, a treat or even start to engage him in a game.