Faced with an offer to travel together, a careful diplomatic evasion is required to maintain peace. Fearing that a newly reconciled brother might easily turn back into an enemy on the open road, a tactic is needed to part ways amicably [ביאור יש״ר]. The fundamental issue is that the slow, deliberate pace of a family and its livestock cannot possibly match the rapid march of a military camp [ביאור שטיינזלץ, מלבי״ם]. To justify the separation, the physical limitations of the camp are laid out clearly.
The first limitation involves the youth of the camp. The children are very young, with the oldest being only about twelve or thirteen years old [אבן עזרא, ביאור שטיינזלץ, ביאור יש״ר]. At such a tender age, they tire quickly and might simply refuse to continue walking if pushed too hard [רמב״ן]. Alternatively, one perspective suggests that the concern for the young is actually directed at the newborn animals, since the family members themselves rode safely on camels and were entirely shielded from the physical strain of the journey [חזקוני].
Beyond the children, the livestock present their own delicate challenges. The primary approach among commentators is that the herds consist largely of animals that are pregnant, nursing, or raising their young [רש״י, רד״ק, אבן עזרא, בכור שור]. Because these animals are meant for expanding the flock rather than for labor or slaughter, they require slow, gentle care to ensure their healthy development [רש ר הירש]. Managing them demands a heavy sense of personal responsibility to lead the camp slowly and with the utmost caution [רש״י, ספורנו, מזרחי]. Some note that this responsibility is directly tied to the fact that the animals are actively nursing their infants, making the march even more fragile [הכתב והקבלה, בכור שור].
The core danger lies in forcing the camp beyond its natural pace. If the shepherds were to rush the animals for even a single day out of respect for their traveling companion, simply to avoid delaying him, the outcome would be disastrous [ספורנו, רד״ק, שד״ל, רש״י, בכור שור]. Another unique explanation connects this danger to Sabbath observance: resting on the Sabbath would force a double-paced march the following day just to close the gap and catch up with the faster camp ahead [פרדס יוסף].
The result of such forced exertion would be fatal, specifically for the sheep. As the weakest animals in the camp, sheep would die immediately from the strain, and no amount of subsequent rest could save them [העמק דבר, מחוקקי יהודה]. The cattle, being more robust, might suffer harm from the effort but would ultimately survive [רמב״ן, שד״ל]. Notably, when describing this grim consequence, the prediction of death is carefully limited exclusively to the sheep. Out of deep compassion and a desire to avoid uttering any kind of fatal curse over family or cattle, the warning is deliberately restrained [רמב״ן, הטור הארוך, ביאור יש״ר].