Is it okay for guinea pigs to eat only grass, completely replacing hay?

yes it is ok, and it is actually more valuable as it contains more Vitamin C. Avoid ornamental grass as it can be toxic. This diet should be supplemented, or better complemented, with mixed commercial one anyway. Please do not hesitate to contact us again on the forum or by requesting a consultation if you have any more questions or to discuss it any further.

Hello. Small amounts of fresh grass are acceptable as a treat. Most of the greens fed should be your timothy or oat hays as these are actually more nutritious than grass ( which is mostly water & sugars ). Never feed grass clippings from the mower, & the stemmier the grass is the better. Thanks for using Petco Pet Education Center, formerly Petcoach.

The ideal hay for guinea pigs is a grass hay such as timothy or orchard grass hay. Guinea pigs cannot have clover hay or alfalfa hay as their main diet. You may need to ask the farmers what kind of hay this is to determine if it is the appropriate type of hay for your guinea pig!

Hay is not a bad diet for guinea pigs but the do have an absolute requirement for vitamin C - this can be from vegetables/fruits (sych as peppers, dark leafy greens, brocolli or squashes), supplemented pellets or in Rose's case vitsamin C srops for her water may be helpful also

Guinea pigs require plenty of fresh water, grass or hay, and pellets. They can have up to 1 cup of vegetables per day, but that doesn't mean they need that much. Romaine lettuce is fine in moderation. This site provides a list of cavy--safe foods and detailed dietary instructions. I hope this helps. http://www.happycavy.com/what-can-guinea-pigs-eat/

Yes, it is the same type of hay. I recommend Oxbow brand. You can use orchard grass, timothy, oat or a combination of them. Just do not use alfalfa hay. ( https://www.petco.com/shop/en/petcostore/product/oxbow-orchard-grass-hay )

Hi there! Guinea pigs really like their veggies and pellets, so your guy may be starting to want those more often instead of hay. However, Guinea pigs really need to be eating hay as the main staple of their diet. This makes sure their gastrointestinal tract is always active and working. Try to continue to offer your pig hay and very small amounts of the other stuff. He also needs to have a vitamin C supplement in the diet. If your pig isn't eating much though in general, my biggest concern is always checking the teeth (which should be done a couple of times a year anyway by a veterinarian who is skilled at treating Guinea pigs), and also making sure the pig isn't bloated. Guinea pigs can also colic and have issues with the gastrointestinal tract not moving at an appropriate pace. I would monitor your pig for another 12 hours and if he is not improving, I'd take him in to see his veterinarian to insure nothing serious is going on.