My daughter had a cat that would chew up cords too. Many cellphone charging cords, not to mention rolls of TP, fell victim to that beast.
Anyway... what does your declination cable look like? What I can find online looks like it may be a coiled cable with an RJ45 (8-position) modular connector (same size and shape as the connectors on an Ethernet cable) on each end. Is that right? If so, hold the two connectors side-by side, tab side toward you and both cables cable downward, like this:
Look carefully at the order of the wires in the two ends. They are probably either in the same order or opposite order (the illustration is a Celestron 6-position Declination motor cable; it has the wires in the same order: white on left (position 1), blue on right (position 6), and all others the same at both ends). If yours is an 8-position modular connector with wires in identical or exact opposite order, then a suitable replacement might be one of these:
Note the "Style" column at far right. "Standard" style has a given color connected to opposite pins at the two ends (i.e. 1 to 8, 2 to 7, etc.) and "Reverse" style has a given color connected to the same pins (1 to 1, 2 to 2, ..., 8 to 8). The photo shows a "Reverse" style cable.
The length in the listing is the extended length; retracted length will be about half the extended length. The shortest DigiKey has in stock are 5 feet, manufactured by CNC Tech: P/N 1175-2403-ND (Standard) and 1175-2451-ND (Reverse). Look at the datasheets and verify that the P1 and P2 wiring matches yours you want if you want one of those.
Before using any replacement, compare the wiring order against the original! If they're at all different, bad things are very likely to happen!
Edited by SkipW, 09 November 2019 - 12:28 PM.