The physical shape of a grape creates immediate mechanical risks. Cavies possess narrow airways and specialized hypsodont teeth that grow continuously throughout their lives. A spherical, slippery whole grape presents a direct choking hazard. A cavy attempting to bite into an uncut grape can accidentally pull the entire fruit into its oropharynx, blocking respiration.
Seeds present another distinct danger. Grape seeds are hard, slippery, and can easily lodge in the narrow passages of the throat. They can also wedge between the animal's upper premolars, causing mouth sores and feeding avoidance. Always feed seedless grapes. If only seeded varieties are available, owners must cut the fruit open and pry out every seed fragment before offering it.
Grape skin safety is equally critical. Commercial vineyards apply heavy rounds of antifungal sprays and surface pesticides to protect delicate grape skins from rot. Because guinea pigs weigh between 700 and 1,200 grams, trace chemical residues that humans process effortlessly can strain a rodent's renal and hepatic pathways. Scrub every grape under cold running water for 30 seconds, or buy organic produce whenever possible. The skin itself is fibrous and safe to eat, but it should always be sliced into manageable pieces.
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