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This article has some suggestions that might help: https://www.gardeningknowhow.com/plant-problems/pests/animals/get-rid-squirrels.htm

I would recommend that you look for 'bloom booster' fertilizers. These fertilizers are higher in phosphorus (middle NPK number), which will help the plants have more blossoms. Miracle-Gro Bloom Booster is a popular one. Follow the directions on the product you purchased, as they each have different recommendations.

There are a number of reasons why the leaves may turn yellow. One might be overwatering. Too much water causes yellowing of the leaves and mandevilla do not like overly wet feet. Another possibility could be too little water. If this is the case, the yellow leaves would be curling up as well. Mandevilla favor humid conditions. If your plant is exposed to the sun, the soil may be too hot. Try misting/spraying the leaves with water in the mornings and keep the soil moist (NOT wet). Mealy bugs can occasionally affect these plants, causing them to become weak and leading to yellow foliage. Finally, plant stress due to a change in location, temp., etc. can lead to yellow leaves. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/yellow-leaves-on-mandevilla.htm

It sounds like it has thrips. This article will help: https://www.gardeningknowhow.com/plant-problems/pests/insects/controlling-thrips.htm

It is considered in the list of poisonous plants, but allegedly its toxicity is very low, and no severe symptoms would result from ingesting it. However, to be on the safe side, I would try to keep the cat from going near it, though these animals normally won't bother the vine. Here is an article with toxic plants for cats that may be helpful to you as well: https://www.gardeningknowhow.com/plant-problems/environmental/plants-toxic-to-cats.htm

Mandevilla plants favor humid conditions. If your plant is exposed to the sun, the soil may be too hot. Try misting/spraying the leaves with water in the mornings and keep the soil moist (NOT wet). You may also want to consider moving your plant (if possible) to an area that doesn't receive direct sunlight for extended periods of time. Here is an article that you may find helpful: https://www.gardeningknowhow.com/ornamental/vines/mandevilla/mandevilla-plant.htm